Dr. Jane

40 60 80 100 120 140 160 This represents +/- 3 standard deviations. 68% falls within 80 and 120 95% falls within 60 and 140 99.7% falls within 40 and 160 Using this information and a diagram, I think you will be able to answer wthe questions.

12 years ago

197 N Forces are equal and opposite.

12 years ago

B + H + F = 17 B = 8 H = F - 3 Substitue into the original equation: 8 + F - 3 + F = 17 can you find F?

12 years ago

If you draw the diagram, you will see that 15 is the hypotenuse of the triangle and 4 is the side opposite your angle. Sin x = 4/15

12 years ago

10 x 10 x 10 = 1000 possiblities, but they aren't all unique. For example: 0 + 5+ 0 = 5 and 5 + 0 + 0 = 5 and 2 + 3 + 0 = 5 If you are looking for unique answers, the problem gets much harder.

12 years ago

24 = P + J + C P = 10 C = 6 + J Substitute into the original equation. 24 = 10 + J + 6 + J Cann you solve for J to find Jazz. Then you can find Country by adding 6 to your Jazz number.

12 years ago

a + c + b =12 3 = a b + 5 = c Substitute into the original equation: 3 + b + 5 + b = 12 Solve for b to find the number of boats. Add 5 to the number of boats to find the number of cars.

12 years ago

A constant is a value or number that is entered into a formula.

12 years ago

Yes it is. All forces are equal and opposite.

12 years ago

For every force there is an equal and opposite force. I agree with #2 and I bet you can figure out #1 based on the above.

12 years ago

What happens when you get anesthesia? Did you ever get novacaine?

12 years ago

You are welcome.

12 years ago

You are welcome.

12 years ago

10 + 9 + 9 + 8 + 8 + 8 =

12 years ago

3x^2-2x-8 first derivative 6x - 2 2nd derivative 6x-2 =0 find x and then substitute into the original equation to find y.

12 years ago

Find the mass of Na plus the mass of Cl from the periodic table. That will give you the mass of 1 formula unit. Water is H20 is water. 1 formula unit has a mass of approx. 18 grams divide 44.99 by the exact value to get the number of molecules.

12 years ago

You need to draw a normal curve. Label 1.50 and shade in everything from 1.50 to the right under the tail You can look up this value on a calculator or from a Z-table. Be careful because Z-tables may give you only the lower tail. For 1.06 to 1.96, Again d...

12 years ago

Multiply 15.68 times 15.68

12 years ago

KE = (1/2)(mass)(velocity)^squared To find the velocity: Velocity = (acceleration)(time) acceleration = 9.8 m/sec^2 Also.. you need kilograms instead of grams so be sure to use .1 kg

12 years ago

If weights are symmetric about the median then is you have 90 lbs at the lower quartile, you should have 150 at the upper quartile. Subtract the two numbers to get the interquartile range.

12 years ago

First, change Watts to Kilowatts by dividing by 1000. Multiply that value times the rate per kWh.

12 years ago

.18x International Links 50 + .10x World Connections .18x <50 + .10x solve for x. The inequality shows where International would be less than World.

12 years ago

Distance = Rate x Time Maria's rate is t km/hr faster than Praedup. Maria: (r+6)t = 72 praedup rt = 45 Solve for t in each case: t = 72/(r+6) t = 45/r Since the times are the same the two fractions equal each other. Solve for r.

12 years ago

You cannot conver centimeters into grams. Centimenters measure length and grams measure mass. A cube centimeter (think of a box that is 1 cm x 1 cm x 1 cm) Now, that is equivalent to 1 ml (milliliter).

12 years ago

No, everyone will not have the same result. Over the short run, no one knows what will happen. Over the long run, there is a 1/6 chance of getting each number. So, if you rolled a die 6 million times, you should get 1 million of each of the 6 numbers.

12 years ago

I am getting the same answer. What are the other choices?

12 years ago

You know that p=.65 and q =.35 and n=10 Mean is np SD = the square root of (npq)

12 years ago

It is a. They used the law of logs or lns to rewrite 3 ln x as ln x^3.

12 years ago

Ammonia is a base so as you add drops of ammonia solution, the pH will increase.

12 years ago

a) to have no standard deviation at all would be the smallest possible. SD = 0. I think the same number would have to come up 5 times. b)You would want the widest range of numbers. I am thinking 1's and 6's

12 years ago

.77 have it so .23 don't None of the 3 have it. (.23)^3 All have it. (.77)^3 At least 1 has it means that 1, 2 or 3 have it. It is easier to do the problem in the reverse. If at least 1 has it, the opposite would be none have it. (.23^3) 1 - (.23)^3

12 years ago

Present Value =2000(1+ .07/12)^48 Principal ( 1 + rate/compounding period) raised to the years time compounding.

12 years ago

I think Sell is different.

12 years ago

You are welcome. So many times, students know the Calculus, but it is something from past math courses that cause the issue with finding the final answer.

12 years ago

I would start with the of part first... for example if you are dealing with thirds, choose numbers like 3, 6, 9 something that is divisible by 3. For quarters use 4, 8, 16 I will get you started with # 7 I will start with 9 _____ is 2/3 of 9 Multiply 2/3...

12 years ago

Factor 45 into 9 times 5 Since 9 is a perfect square, you can take its square root and you will have the 5 left under the square root sign.

12 years ago

x + y = 26 The number of tickets 4x + 7y = 140 The value of the tickets. Multiply the first equation by -4 and then add the two equations together. Solve for y. You can then use the original first equation to solve for x.

12 years ago

You can square both sides of the equation that wil give you: ln x/(ln^2x) = 6 Multiply both sides by the denominator ln x = 6 ln^2 x Subtract ln x from both sides which sets the equation equal to zero. Factor by removing the greatest common factor of ln x...

12 years ago

You have to write your own essay. Someone here will check it for you.

12 years ago

You have to write this yourself. Post it here and someone will check on it for you.

12 years ago

No one here will write this for you. You have to do it yourself and then post it for comments.

12 years ago

2.25 times 12 months will give you the APR.

12 years ago

One idea: I know that a square is the largest area. If you have a perimeter of 16 it would be best to make each side 4 if you want the largest area.

12 years ago

I have seen this posted a few times and no one has answered it. I know it is not amortization because that deals with reducing an amount of money like a mortgage. It is not present value because we are looking for an amount of money in the future. It coul...

12 years ago

Distance = velocity x time .745 = velocity x 22 divide both sides by 22 to get the velocity for the first leg. .745 = velocity x 27 do the same to get the velocity for the second leg. to get the average: add the two velocities and divide by two.

12 years ago

What punctuation? Commas, semicolons, periods, question marks, etc...

12 years ago

50 plus 5 times 7 I you add 5 extra dollars each month for 7 months that would be $35 extra. Also, watch your order of operations. Bob showed you 50 plus 5 x time. You always do the multiplication first then the addition.

12 years ago

No one will write this program for you. You need to write it yourself and post it here for critique.

12 years ago

If you factor by the guess method.. First remove the negative sign. Factor out a negative 1. -1(12 x^2 + 35x +18) Now, work with the 12x^2 + 35x+18 Think of multiplying binomials (12x + ?)(x + ?) (3x + ?)(4x+ ?) (2x + ?)(6x + ?) What can the ? be... 18, 1...

12 years ago

Yes, you can use a chart. Interest = Principle x rate x time Time is 1 year Interest = Principle x rate x time They invested the same amount. Rachel: x = .08 P (x = Rachel's interest) Rosa: y = .09 p ( y = Rosa's interest.) y = 500 + x so, you have x = .0...

12 years ago

You are asking about v = s^2 Did you ever graph y = x^2 That is definitely a quadratic. Do you think v = s^2 would be one too?

12 years ago

Force = mass x acceleration. Really, you need the net force. If friction works in the opposite direction, you have a net force of 8900-2230. Use that value in the equation for force and 13,100 kg for mass. You can then solve for acceleration in m/sec/sec...

12 years ago

640 steps x 55 cm/step = the circumference of the outer edge of the circle. Circumference = 2 times pi times radius. The radius of the outer circle that the man walked, it 95 + r This includes the radius of the inner circle called "r" C = 2 times 3.14 tim...

12 years ago

To calculate continuous compounding you use e^rt.

12 years ago

I am not sure what you mean by 1. If you are just betting on one number there are 38 possible outcome if one number is chosen. For your second one, this is a combination. taking 12 out of 38. 38!/((12!)(26!)) Do you know what factorial means? For example:...

12 years ago

You need to find the z-score (40 - 50)/10 = z (60 - 50)/10 = z So, you are looking for -1 and +1 standard deviations. Find the area between -1 and +1 standard deviation by using a z-table or else by using the 65.. etc, rule.

12 years ago

If you have the area and the base, you can find the height. A = (1/2)bh

12 years ago

You need more information to answer this question. Probably we need the mean and standard deviation of all the bags.

12 years ago

Friction of the sled causes an increase in temperature which causes melting. Right? It also may compress the snow due to the weight of the sled. Pressure alone on snow may cause melting.

12 years ago

I think it is developed.

12 years ago

A cube has 6 sides. Divide 294 by 6 to get the area of 1 side. Take the square root to get the length of a side. Volume is s^3.

12 years ago

7000 = P(1 + .04/365)^3650 solve for P.

12 years ago

I think you are missing part of your question for B. A can be a subset of itself, so it would include everything The null or empty set is also a subset. Each number could be in its own subset. We are up to 8 subsets. Also, we could take two numbers at a t...

12 years ago

log(5x+40)^10 = 10 I used the law of logs to transform to the exponent. Next- change to exponent form. (5x+40)^10 = 10^10 Since the powers are the same, the bases must equal each other 5x+40 = 10 solve for x.

12 years ago

Add the Males and Females that take the bus and divide by the total number of students. Male or Travel by Car Add up all the males and then add in the females that drive by car. Divide by the total number of students. If a car drives: Add 37 + 45 to get t...

12 years ago

You need a z- score 70 - 64.5 divided by 2.5 Once you get the z-score, use a calculator or normal table to find the probability to the right of that z-score.

12 years ago

This is the chain rule used several times. Begin with EVERYTHING you stated all cube rooted. Rewrite as (Everything)^1/3 the derivative is 1/3(Everything)^-1/3 then you have to take the derivative inside the ( Everything) and multiply it by your first ste...

12 years ago

Change 6" to feet. 12" = 1 ft 6" = .5 ft Multiply .5 x 3 x 3 to get your answer since volume is lxwxh

12 years ago

For denominator you have to multiply the two binomials. (1-x)(2-x) Multiply 1 times the terms in the second binomial then multiply -x times the terms in the second binomial. 2 -x -2x +x^2 simplify to 2 -3x + x^2 rewrite in descending order to get x^2 -3x...

12 years ago

First find .15 times 3500 You will subtract that number and the 1950 from 3500 to see what is left.

12 years ago

1.9 = (2.0 -x)/x^2 Multiply both sides by x^2 1.9x^2 = 2.0 - x Add the opposite to both sides so that you have 0 on one side. 1.9x^2 + x - 2.0 = 0 Now, you can use the quadratic to solve for x. Quadratic: -b +/- the square root of (b^2 - 4ac) all over 2a.

12 years ago

do you want to solve for t? If so, subtract 20 from both sides the divide both sides by -9.8

12 years ago

I = Principle x rate x time I = 300 x .22 x 1

12 years ago

1 mole of gas occupies 22.4 liters at STP which is Standard Temperature and Pressure.

12 years ago

Looks like someone's homework assignment or maybe even a take home test. No one here will do your homework. Work out the problems and we will be happy to check your answers.

12 years ago

Are you supposed to simplify? Are you adding two fractions? I really cannot follow the problem.

12 years ago

What do you normally say if you have pictures in front of you and you want someone to view them? Would you say, come here to watch my pictures? Come here to look at my pictures? Come here to see my pictures?

12 years ago

You might have people randomly assigned to the three shampoos and block by age. Shampoo A B C age group 1 age group 2 age group 3 Give each age group shampoos A, B, C. have them use each shampoo for a week and then rate them.

12 years ago

What is the question? Are you looking for the rate per year? If so, the change is 4 acres in what time span. Subtract 1922 from 2001

12 years ago

I would add -25x to both sides and add -50 to both sides. giving you 5x = 25 divide both sides by 5 to finish the problem.

12 years ago

x = amount at 7% y = amount at 6.25% x + y = 10,000 or x = 10,000 - y .07x + .0625y = 656.50 You can solve by substitution: .07(10,000 - y) +.0625y = 656.50

12 years ago

It should be (-5,6)

12 years ago

Find the z-score 90-80 divided by 10 Use the z-score to find the probability to the right of that score.

12 years ago

L = 7 + W P = 2L + 2W 62 = 2(7+w) + 2w

12 years ago

D = 16 -6x b) substitute 1.5 for x c) substitute 5.5 for D

12 years ago

x + y = 23 x - y = 5 add 2x = 28 find x, then find y

12 years ago

This means there has to be three decimal places. so your choices are 1.838 or 1.839 You increase the number if the one after it is 5 or greater. This rounding is also referred to as to the nearest thousandths place.

12 years ago

It looks like 8 was divided by 2 to get 4 then multiplied by 3 to get 12 Some number must have been divided by 2 to get 12 then multiplied by 3 to get 36. I think that a number divided by 2 = 12 Must be 24.

12 years ago

45% of the total = 9 .45(x) = 9 divide both sides by .45 x = 9/.45 That will give you the total distance. subtract 9 from that answer to get how much farther.

12 years ago

0 = (x-4)(x+5)(x-5) Set each equal to zero and solve for x. That will give you three different zeros. Each occurs only once.

12 years ago

x = -b/2a gives you the x-value of the vertex. find y by subsituting into the original equation. axis of symmetry uses the information found above. Factor your equation and set = to zero to find the intercepts Is there a negative sign in front of the x^2...

12 years ago

for a slope of -2 The y value would increase by 2 and the x value would decrease by 1. This gives us (0,9) or The y value would decrease by 2 and the x value would increase by 1 This gives us (2,5)

12 years ago

Your overall displacement is zero since you ended up back where you started.

12 years ago

I think at the prealgebra level, your teacher would be looking for positive. As height increases, weight increases which is a positive relationship.

12 years ago

Are you trying to factor? I assume you use the guess method.. (6x ) (x ) (3x ) (2x ) These are possible first terms in your binomials Possible second terms are -1 and 15 or 15 and -1 3 and -5 or 5 and 3 You begin by entering the possible second terms into...

12 years ago

1.1704 x 10^2 You always have one place to the left of the decimal point.

12 years ago

You are welcome!!

12 years ago

The yearly rate of change total amount of change divided by the number of years between 2003 and 1918. acreage = the yearly rate(that you calculated) times t.

12 years ago

You have to find the z-score for .03 from a table. Substitute it below to solve for standard dev. z-score = (39.2 - 58)/stand.dev.

12 years ago

-2x-4y = 1 6x + 12y = -3 I just rearranged the second equation. Multiply the top equation by 3 and then add the two equations together. You will get 0 = 0 which means there are an infinite number of solutions. This happens any time you get a true equation...

12 years ago