Math

This page lists questions and answers that were posted by visitors named Math.

Questions

The following questions were asked by visitors named Math.

2/7 divided by 6 I know to invert the fraction, then what? Please help! 2/7 divided by 6/1 = 2/7 multiplied by 1/6 Multiply and then reduce. http://mathforum.org/library/drmath/sets/select/dm_divide_fract.html =)

I can't figure this out. Please help! Estimate 16 20/21 * 28 3/7 - 4 13/25 + 8 2/47 as a whole number or as a mixed number where the fractional part is 1/2 Someone please help! 17 * 28 - 5 + 8 would give you an estimate. However, since you don't have pare...

How do you find critical points in a function? For example, find the critical points in f(x)=12+2x^2-x^4 please help me somebody find the derivative and set it equal to zero

I had to solve for this: 1) choose 4 people from a class of 12 My answer: n=12 r=4 12C4 = 495 2) chosse 8 people from a class of 12 my answer: n=12 r=8 12C8 = 495 why is it that they both eqaul 495? maybe I am doing it wrong but I am confused why do they...

I have a factoring question; what is 8a^2-8a-30? I've been working on this for a while and I think I understand factoring, but I'm not getting the right answer, which is supposed to be 2(2a-5)(2a+3). Any help would be so appreciated! :)

can someone give me proof that a negative number times a negative number is a positive number I've always been told this in like seventh grade that it is but havne't been given any proof

i'm not sure how to evaluate this (6)/(X^-4) + (5)/(X^-2)

Solve: 8p-4 = 4(2p-1) Isn't it equals to 0?

I need help with these three problems. I cant figure them out. 3. The difference of two numbers is tripled. The result is decreased by 1. If the lesser of the two numbers is 4 the result is 8.3. Find the greater number. 4. A number increased by 21 is ewui...

The instructions to my book work says for the data in each table, tell whether y varies directly with x. If it does write an equation fo rthe direct variations. Well how do you do that exactly. Thanks you for your help.. Please help me.

I'm trying to create a graph in excel and how come when i put this into my graph (21.8(151.1)^-1)100 I get undefined and all my calculators on my computer also give me undefined however my ti 83 gives me an answer around 19

Payments of $1800 and $2400 weere made on a $10,000 variable-rate loan 18 and 30 months after the date of the loan. The interest rate was 11.5% compounded semi-annually for the first two years and 10.74% compounded monthly thereafter. What amount was owed...

A bank offers a rate of 5.3% compounded semi-annually on its four year GICs(Guaranteed Investment Certificates). What monthly and annually compounded rates should it quote in order to have the same effective interest rate at all three nominal rates?

When you write 2,500 in expanded form, how many addends do you have? 2,000+ 500+0+0 ??

I am not sure on this question. Can you help me. Question: How can you tell if 31/33 is already in its simplest form? I wrote my answer to the following questions, can you tell if it is right? Question: Can the Greatest Common Factor of 18 and 36 be great...

I am confused what would be a real-life solution using polynomial division.

This is a question given to me to answer:How is dividing a polynomial by a binomial similar to or different from the long division you learned in elementary school? Can understanding how to do one kind of division help you with understanding the other kin...

(2x^(2)+7x-15)/(2x^(2)+13x+15)

Write a two column proof. 1.Reflexive property of Congruence. -Thanks

lim as x approaches negative infintiy (x^2+x^3) I just don't know where to start

During a week in December on anchorage, Alaska the daily high temperatures were 20,18,-10,15,-15,25, and 11. Write an expression to find the average daily high temperature during that week.

Is the square root of x^23 = x^11

Train A is traveling at 100 mph and train B is traveling at 104 mph. Train A passes a station at 12:15 p.m. If train B passes the same station at 12:45 p.m., at what time will train B catch up to train A? HELP please I am drawing a complete balank at figu...

Need to write fraction as a whole or mixed number. Express fractions in simplest form.. 1. 76/12 Answer= 6 1/6 2. 88/10 Answer= 8 2/5

A study has shown that 20.05% of all college textbooks have a price of $80 or higher. It is known that the standard deviation of the price is $10. What is the mean price of the college textbooks? Assume the price is normally distributed.

The sales (in millions of dollars) of a laser disc recording of a hit movie t years from the date of release is given by S(t)=[{4t+1}/{t^3+1}] How fast is the sales changing one year the laser discs are released?

A manufacture of a certain commodity has estimated that her profit in thousands of dollars is given by the expression -6x^2+30x-10 where x (in thousands) is the number of units produced. What production range will enable the manufacturer to realize a prof...

can someone help me write out these expressions? 4 more than p: product of c and 15: the quotient of n and e: The quotient of 17 and k: 23 less than x: the sum of v and 3: the sum of 9 and k minus 17: 7 more than 5 times n: 85 less than the product of t a...

another question, im so confused!D: it says: Define variables and write an EQUATION for each phrase: 1.)The total cost is the number of cans times 0.70. Let ___ represent total cost and let ____ represent # of cans. __________________

what is the domain and range of g(m)=m^2 - 5m

For a 3-person relay race, a coach can choose from 4 of his top runners.how many different 3- person teams can he choose ? Use the act it out strategy.

I need help finding the key points for the graph y=1/3 cos x and y=-sin 2piex/3 I just don't understand how to graph this and find keypoints.

chung ho is standing on the top of a building that is 135m tall. The angle of depression to the top of the building next door is 71 degrees. The angle to the base of the building is 77 degrees. The buildings are 31m apart. How tall is the other building?...

bernhardt and julia are observing an eagles nest in a tree. Julia is 75m from the tree, and sees it at an angle of elevation of 42 degrees A)How high up the tree is the nest B)Bernhardt is standing 30m behind julia. At what angle of elevation does he see...

Triangle ΔABC has vertices A(2,5), B(8,1) and C(-2,-1) and is a right triangle. If the slope of AB is -2/3 and the slope of AC is 3/2, are the lines parallel, perpendicular or neither?

For all positive integers w and y, where w > y, let the operation ☺ be defined by w ☺ y = (2^(w + y))/(2^(w - y)). For how many positive integers w is w ☺ 1 equal to 4? A. More than four B. None C. One D. Two E. Four *I found only 3/5 as the answer but it...

8/2 [2/ 9] how to simplfy above question.

solve the equation & check your solution

A group of hikers on a mountain began at an elevation of 3040 feet above sea level and stopped at elevation of 2319 feet above sea level. What was their change in elevation between these points? How can you tell from the change in elevation whether the hi...

on a farm there are rabbits and chickens. Altogether, there are 20 heads and 50 feet. How many rabbits and chickens are there?

In an AP the 6th term is half the 4th term and the 3rd term is 15. a. Find the fist term and the common difference. b. How many times are needed to give a sum that is less than 65?

A mortagge is taken out for $10,000 and is repaid by annual installments of $2,000. Interest is charged on the outstanding debt at 10%, calculated annually. If the first repayment is made one year the after the mortagage is taken out, find out the number...

A bank loan of $500 is arranged to be repaid in two years by equal monthly instalments. Interest, calculated monthly, is charged at 11% p.a on the remaining debt. Calculate the monthly repayment if the first repayment is to be made one month after the loa...

Julie is digging a square area in her backyard for a vegetable garden. If the area is 52 square feet, what is the approximate length of one side of her garden? 6 square feet 7 square feet 8 square feet 9 square feet 7 square feet is my answer, what's your...

Find absolute maximum and minimum for f(x)=(3x^3)−(18x^2)+27x−10 over the closed interval [2,4]. Thank you so much!!

Identify the molecules that participate in the light dependant reactions and tell what they do.

graph this equation:6x^2+18x-24=0

A ⊆ B. Prove P(A|B)>= P(A)

The area of a cylinder is 956m3. If the circular top is halved, what is the new volume?

On a windless day, a bird can fly at a constant 10 m/s. It flies 6.0km east and then home again. How much time does the round trip take? I keep getting 600 seconds, but my teacher still tells me it's wrong.

Eric has a two rocks samples. One has a mass of 600 grams and the other has a mass of 1 kilogram. He recorded the total mass as 7 kilogrmaas. Explain what he did wrong? What should be the correct answer in grams?

only 2/9 the university students wanted to become math teachers. if 2800 didn't want to become math teachers how many university students were there? So, 2/9 * WN = 2800? How would you work it out?

Simplify 4sqrt6/sqrt30 by rationalizing the denominator

A shop owner bought 30 folders and some journal. He paid @82.50 for the folders. Each journal cost 10 times as much as a folder. What was the cost of each journal?

Plastic tub has capacity of 13.5 quarts. It can hold 3 times as much liquid as a pail. Pail can hold twice as much liquid as can. Find capacity of pail and that of the can in quarts.

I need some help solving this system of equations: 5x - y = 18 –4x – 2y = –6

45% of 75% of a number is 70, what is the number? Express your answer as a common fraction.

After 15% off, the book price becomes $26, what was the original price of the book? Round to the nearest cent. I had $29.9 but it was wrong :(

How to get from general form to intercept form in quadratic equations. I'm not sure if it's possible. Or how do you get from vertex form to intercept form. .?.

The answer to a question is 564.90. The question said to round to the nearest ten meters. What does nearest ten meters mean. Would it mean for me to round to 570 or 565

Three circles with radii 35cm, 50cm, and 65cm respectively are tangent to each other externally. Find the angles of the triangle formed by joining the centers of the circles. My teacher said to use the cosine law cause you know 3 sides but no angles. But...

the average attendance of a class from monday to wednesday was 39 and that from wednesday to saturday was 39.5. What was the attendance on wednesday, if the average attendance from monday to saturday was 40 I did this:- m+t+w/3=39 w+Th+F+S/4=39.5 m+t+w+Th...

Is there any good websites for online quizzes or tests on inductive reasoning?

how many fractions between 1/4 and 1/2

solve 7 1/2 - 3 5/6

What is the least number of square pieces into which a cardboard, 13 ft long 8 ft wide, can be cut?

How many positive factors does 62x(63^3+63^2+63+1)+1 have? (With explanatio pls... Tnx)

Assume a box contains three red jelly beans and two green ones. We consider the event that a red bean is drawn. Suppose I pick a jelly bean from the box without looking. I record the color but do not put the bean back in the box. Then I choose a bean agai...

On Halloween, a man presents a child with a bowl containing six different pieces of candy and six different pieces of gum. He tells her that she may have four of each. How many choices does she have? Answer as a whole number.

Signals The king has 10 (different) colored flags that he uses to send coded messages to his general in the field. For example, red-blue-green might mean “attack at dawn” and blue-green-red may mean “retreat.” He sends the message by arranging three of th...

Two cards. Refers to choosing two cards. If you do not put the first card back in the deck before you draw the next, what is the probability that the first card is a club and the second card is a diamond? Leave your answer as a fraction in SIMPLEST form....

The rate of inflation in Ethiopia was 41% in 2008. What was the percentage decrease that year in the buying power of the birr (the currency of Ethiopia)? A. 41.0% B. 69.5% C. 29.1% D. 37.5%

10. Suppose the stock of Microsoft increases in value by $5 per share. If all other Dow stock prices remain unchanged, how does this affect the DJIA? A) 37.80 points up B) 30.24 points up C) 22.68 points up D) 15.12 points up

You have a balance of $7500 on your credit card and you make no further charges. If your APR is 12.5% and each month you make only the minimum payment of 5% of your balance, then find a formula for the balance after t monthly payments. A) 7500(0.959896) t...

Assume that you have a balance of $5000 on your Visa credit card and that you make no more charges. If your APR is 22% and each month you make only the minimum payment of 3% of your balance, then find a formula for the balance after t monthly payments. A....

You have a balance of $12,000 for your tuition on your credit card and you make no further charges. If your APR is 16.7% and each month you make only the minimum payment of 2% of your balance, then find a formula for the balance after t monthly payments....

If the angles of triangle are in the ratio of4:1:1then find the ratio in the smallest side / perimeter of the tringle

How do you do 4ln(2x+3)=11

Let v(t)=t^2−3t be the velocity, in feet per second, of an object at time t , in seconds. (c) What is the meaning of the quantity v(4)? Select all that apply if more than one statement is correct. A. In how many seconds will the object have moved 4 ft. B....

There are 8 boys on a bus. Each boy has 8 backpacks. In each backpack, there are 8 big dogs. For every big dog there are 8 little dogs. How many legs are there in the bus?

1) How do you create a fractal? 2) How are midpoints,lengths,equations for circles used to generate the fractal (pattern in pinecone). 3) What are some special features of this fractal (pattern in pinecone)? Describe a specific application of fractals, su...

Using the table of values -2,-1,0,1,2, what would be the "Y" when given these set of equations? y= 3^ y= 2 ^ y = (1/2)^ the ^ is a tiny letter x exponent that we sub in with the table of values

Ms. Vellake loves to read. She read 522 hours in 29 weeks. If she read an equal number of hours each week, how many hours did she read each week?

Write in terms of cos and sin function. cotx*secx I know cotx = cosx/sinx and sec x= 1/cos x. but how do i solve it?

A circular sinkhole has a circumference of 75.36 meters. A week later, it has a circumference of 150.42 meters. a. Estimate the diameter of the sinkhole each week. The sinkhole is about ? meters the first week. The sinkhole is about ? meters the second we...

In a piggy bank Jane has 8 more quarters than dimes and she has 5 less nickels than dimes. Write an algebraic expression

Make a table and graph each quadratic function. Use integers from -3 to 3 for inputs. #4- y= -x2 #5- y=2x squared #6- y= -8x squared #7- y= x squared + 2 Make a table and a graph for each function. Use only positive values for x. #10- y= 10/x #11- y= 8/x...

Sum of first six term of an ap is 46 ratio of its 10th term to that of 30th term is 1:3. Find its 13th term

If there are 5 boys and 7girls, in how many ways can 5 boys and 5girls sit in a round table? Is the ans : 5!*4!*7c5? Reason: since there are 5 boys so (5-1)! And left 5 seats for girls so 7c5 and within the girls theres 5 diffrent ones so another 5!

Alice paints at a rate of 10 square feet per minute and Bob paints at a rate of 8 square feet per minute. If they work together, how many square feet can they paint per minute?

Problem 1. Suppose x > 0. Simplify the expression [(x+h)^1/2− (x) ^1/2]/h . For what values of h is this expression defined?

In a particular year, a total of 63,172 students studied in two of the most popular host countries when traveling abroad. If 7306 more students studied in the most popular host country than in the second most popular host country, find how many students...

Answers

The following answers were posted by visitors named Math.

100x2 + 90x - 90x - 81 = Answer:100x2 - 81

-13=2b-b-10 1st step. (2b-b) = -13=b-10 2nd step- Make sure the variable (b) is on one side. We must add 10 to each side to make sure that variable (b) stands alone. -13 = b - 10 +10 = b + 10 ----------- -3 = b

now i'm trying to find a percent

The answer is 13. 13 times 2 = 26 13 times 6 = 78 13 times 4 = 52

oh! I was trying to make it harder than it was! thank you!

27!/(27-4)!4!= 27 C 4

$20,000 x 15%=3000 commission is for sales over $12000 $12000 + 20000= $32,000

If you are asking if they are correct they are

im not sure im not an actual tutor but i just averaged the two 40+60= 100 divided by 2= 50

how long did he kick it..like 1 minute?if its one then 58x60(sec)=your answer

Sorry, please ignore this one

thank you so much for your help

The first and third terms of a gp are 5 and 8 respectively what is the 4th term

Posting Brilliant Questions!! You will not learn from it..such a spoiled brat!!

PLEASE SOLVE THE QUESTIONS..INSTEAD OF POSTING IT..BRILLIANT DOES NOT TOLERATE THIS KIND OF AKSING

How did you get 34% and 16%? Thanks

How u get that answer

Didnt give us the choices yet and that's how the question is written

I know the decimal, but I don't know how to find the repeating (407407407407...407...)

Is there a way to make it a common fraction or does it HAVE to be a mixed number or improper? Because the question says it has to be a "common". :)

I can't. I keep getting the same 3.90 over and over again!

I don't get it!

Tnx... But where did exponent 4 and minus one come from?

Eighteen is correct. I had the same problem and got it right

I got 518400 but it's considered wrong.

B.16 In set T there are 7 numbers which suits n<50 and square root n is an integer. 1,4,9,16,25,36,49 median is the middle number, therefore answer is 16.

About how many days does it take for your heart to beat one million times.

Do it on ur own jeez

97 - 88 = 9 9 + 88 = 97

Question: Two cars driving towards each other from towns that are 150 miles apart. The first car is traveling 45 miles per hour, and the second is traveling 55 miles per hour. If each leaves at 2:15, when will the two cars pass on the road? Answer: Relati...

I forgot to add that the boys and girls need to be in alternated seats

Write out the full question please

Yes it is 9 to 5 but what other ratios

But how did you get 3/16?

Yo was right for lesson 4 unit 6 (Pre-Algebra connexus

D D D THIS IS THE CORRECT ANSWER

Also between weighs and pounds its 7/2

I took it and it says the answers are 1. B 2. A 3. B 4. C 5. B I changed answers 4 and 5 on my own before subbmitting and I am glad I did because this it what it says is right.

Idk find it your own self

I got 2/16 but I’m bad at math so idk

The best answer is 24 OR 15 depends if you do more steps

This is a test question. No more answers please.

These are questions from a test. Please do not respond.

nvm i found it ez

what angles are we classifying?

A. 35% girls picked volleyball. B. 33% boys picked basketball C. 43% students picked track.

Lol never mind I found the solution on my own! The answer is D.

Since 12 play football and 17 play soccer we add those up and subtract to find how many do not play any and then since the 5 students play both we could just add it what we got by adding 17 and 12 and then subtracting it from 30 which gives you 1, so ther...

My apologies. Had time to check #2 and #7. Ignore my previous answer. 2. A 7. C

6465 yd^2, do we divide by 4 now?

Thank you oobleck.

D = 29 C = pi * 29 C = 91.06 inches

What's a number story that can be modeled using 3x 4 5/9

Why Cos? It's tan

GRADE 10 ??? THIS IS GRADE 10 NOT 12

If a 54-piece set of stainless steel flatware costs $124.20 at Bed Bath & Beyond, what is the cost per piece?

Nobody is going to see this but WHY ISN'T THAT WIDTH IN THE PICTURE IS IT THE HYPOTENUSE SO MANY QUESTIONS?!?!?!

percent = decimal fraction times 100

PsyDAG, you got it wrong. If you look at your first comment on this question, you stated: "1 ruppee = 1.00/32.35 dollars" "160 ruppee = 16(1/32.35)" "= 16/32.35 dollars or $0.49" However, you multiplied the 1 ruppee by 160 to turn it into 160 ruppee, so y...

As you can see, you contradicted yourself in your second comment by saying: "However, I think if 1 ruppee = 1.00/32.35 dollars then 160 ruppee = 160(1/32.35) leading to $4.90" This time, you got the calculation right, so I'm sort of confused by your "righ...

Also, the question asks for you to find the person with the highest pay in USD. Like Charles stated, you didn't really find the answer, you just showed part of it. The reason why the asker posted this question is because he doesn't know the answer or need...

A garden is 30 meters wide and 40 meters long. There is a pathway that runs along the perimeter inside the garden. The area of the pathway is half of the area of the garden. What is the width of the pathway?

Umm I'm not familiar with this question... maybe that since 5% equals to 30 the reptiles and birds have 30 students each and the fish is just 2 times more percentage, so you would multiply 30 by 2 and get 60. 35% is multiplied by 7 to get 210, so there ar...

Great Anonymous, but how to get to 0.05 is that you make the 5% of birds into a decimal. So the answer all together is the percentage of birds converted to a decimal is 0.05 and if 30 students vote on the 5% of birds the you would have 0.05x =30. you woul...

Nope, our teacher probably gave this to us to see if we can figure it out. But I haven't been able to.

Thx. He's right.

Sorry, but how does that work?

What is the answer!!!!!!!

What is g stand for

Consider the squares shown. Square P has a side length of 12 centimeters. Square Q has a side length 25% smaller than Square P. A=determine the area of both squares B=Determine the percent decrease in area from Square P to Square Q

Just multiply the length,width,and height and then multiply how many cubic inches 1 quart is and the answer should be 221,760 quarts of watermelon seeds

3 + 2 = 5 1/6 x 5/1 = 5/6

2. A 6.5 ft tall car standing next to an adult elephant casts a 33.2 ft shadow. If the adult elephant casts a shadow that is 99.6 ft long then how tall is it? Hint: If you can draw it, you can solve it. *

Katie works at a coffee shop and as a babysitter. She worked twice as many hours babysitting than she did at the coffee shop last week. She earns \$8/hour at the coffee shop and \$10/hour babysitting and earned a total of $168 last week. How many hours di...

12 and 10. Respect your teachers