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Do you know how to use the quadratic formula?

12 years ago

Slope intercept form: y = mx + b Slope m = ( y2 - y1) / (x2 - x1) Once you find m, substitute that into y = mx + b. Then use one of the two given points and substitute them into the previous equation. This will enable you to solve for b.

12 years ago

Draw this on a graph. Put point A on the positive y-axis. From A, draw a line that looks to represent 80 degrees, to the x-axis at point B. The distance from the origin to B is what you want to find. In that right triangle with right angle at the origin,...

12 years ago

Yes. The opposite of - 51/4 is 52/4.

12 years ago

Sorry. Typo. 51/4

12 years ago

Yes. sin 60 = x/2000

12 years ago

Yes. 6x = 48 therefore x = 8

12 years ago

You're welcome!

12 years ago

Yes, 7 DVDs but only 3 BRs. Remember there a total of 10 movies were bought.

12 years ago

here's how DVD + BR = 10 and 12 X DVD + 23 X BR = 153 solve first equation for BR in terms of DVD then substitute in the second equation

12 years ago

Yep. Like how you showed you got the answer.

12 years ago

This means that 1 inch on the blueprint represents 72 inches in the room. Then, 2 on the blueprint would represent how many inches in the room? Change your answer of inches to feet.

12 years ago

Well, in the second equation of the first pair, solve for y in terms of x. Now take that value of y and substitute it in the first equation of the first pair. Simply that equation and solve for x

12 years ago

Do you mean 4.25 x 10^6 seconds? If so, multiply it by the number of seconds in an hour.

12 years ago

In x years, Kim will be (x+15) years old. How old will her father be in x years? Twice Kim's age will be equal to her father's age.

12 years ago

let n = the decimal number Then 10n = 291.6 solve the equation for n

12 years ago

in the first equation, let x = 0 then y = 5 Plot the point (0,5) . Now let x = 2 Then y = 4 Plot the point (2,4). Draw the line. Do the same thing to draw the line for the other equation.

12 years ago

let p = cost of peanut butter cookies let c = cost of chocolate chip cookies p + c =

12 years ago

x = number of answers y = number of incorrect answers 3 x - y = 18 x + y = 10 add the two equations and solve for x check your answer

12 years ago

what did you get when you added the two equations?

12 years ago

by the way, x represents number of correct answers - I left that out initially

12 years ago

(3x - y) + (x + y) = 18 + 10 4 x = 28 x = ?

12 years ago

Area of one square is side ^ 2 Area of two squares is 2 s^2 2 s ^2 = 2500 you finish

12 years ago

You're welcome Matt.

12 years ago

A = s^2 (A is area, s is side of square) 2A = 2s^2 (for two squares) 2A= 2500 2s^2 = 2500 s^2 = 1250 s = square root of 1250 Perimeter = 4 s

12 years ago

let x = width 2x + 4 = length A = lw A = x(2x + 4) 400 = x(2x + 4) 400 = 2x^2 + 4x 200 = x^2 + 2x x^2 + 2x = 200 do you know how to complete the square?

12 years ago

Great!

12 years ago

If one package costs $1.30 Then 4 packages will cost 4 x $1.30 just multiply

12 years ago

If 6 hair clips cost $43.90 Then one hair clip will cost 43.90 divided by 6. After you divide, then multiply by 4.

12 years ago

d = number of dimes n = number of nickels d + n = 10 .10d + .05n = 1.00 Solve the first equation for n or d and substitute it into the second equation.

12 years ago

put an 8 in the blank spaces

12 years ago

Do this one just like I showed you in the previous one.

12 years ago

Use the Pythagorean Theorem. (AB)^2 + (AC) ^2 = (BC)^2 substitute for AB and BC. then solve for AC

12 years ago

In the last question that you asked for help, I told you to put 8 in the blank spaces. Do you know why I chose 8? What number will you put in the blank spaces this time?

12 years ago

You are solving the equation w - 8 = 26 If you add 8 to the left side of the equation, you will have only w on the left side. But, if you add 8 to the left side of the equation you must add 8 to the right side of the equation w - 8 + 8 = 26 + 8 w = ?

12 years ago

right

12 years ago

Rose, Sorry, I got in a hurry.

12 years ago

Yes!

12 years ago

No, the first blank will not be zero. However, - 8 + 8 is zero

12 years ago

Does middle of circle mean diameter or radius?

12 years ago

Does the line cut the circle in half? If so, it is a diameter. Otherwise it would be a radius. C = pi * d Or C = 2 * pi * r d represents length of diameter and r represents length of radius. Use 3.14 for pi.

12 years ago

Right on!

12 years ago

You are welcome!

12 years ago

This platform has 6 rectangular faces. Two of them are 1 ft by 6 ft Two of them are 1 ft by 4 ft Two of them are 4 ft by 6 ft Find the area of all rectangles.

12 years ago

A = 1/2 bh 18 = 1/2 (9h) multiply both sides go equation by 2 simplify the equation solve for h

12 years ago

Write the equation for area of parallelogram then work it like the triangle problem.

12 years ago

Change 6 3/4 feet to inches divide that by 8 inches to get the number of boards. Or, you can change 8 inches to 8/12 or 2/3 feet and divide 6 3/4 feet by 2/3 feet to get number of boards.

12 years ago

Oops! I misread the question. After you find number of pieces, multiply it by either 8 inches or 2/3 feet. That tells you how much wood was used. Now subtract the amount of wood used from 6 3/4 feet. I used 2/3 feet for 8 inches.

12 years ago

New width = 12 + x New length = 14 + x Area = (12 + x)(14 + x) = 225

12 years ago

This concrete slab is a cylinder with a height of 4 inches and a circular base with a 14 foot diameter. Volume of cylinder = pi * radius^2 * h Substitute the values given remembering to change 4 inches to 1/3 foot. After you find the volume ( in cubic fee...

12 years ago

What is the question>?

12 years ago

All are correct.

12 years ago

A = 1/2bh 52 = 1/2(2x+4)(x +3) multiply both sides of equation by 2 104 = (2x +4)(x +3)

12 years ago

Answers are correct. The best way to write the answer to number 3 is $3.00.

12 years ago

That line with the "x" on it is the height of the triangle. A = 1/2bh 600 = 1/2(2x + 2)(x) 600 = (x + 1)(x)

12 years ago

x = weekly pocket money x/4 = weekly amt. spent on books ( x - x/4) = what's left after books 2/3( x - x/4) = 5 Solve for x. Check your answer.

12 years ago

What do you think? I will check your answers.

12 years ago

x = father's age x - 35 = son's age 3/8 = (x - 35)/x cross multiply 8(x - 35) = 3x

12 years ago

This is asking you to multiply.

12 years ago

Your answer is correct. How did you get it?

12 years ago

What do you think?

12 years ago

change 7/8 to a decimal by dividing 8 into 7.000 divide that number into 1.79

12 years ago

oops! I didn't see the 2 7/8 so after you divide 8 into 7.000, add the 2 to it.

12 years ago

My glass must need to be cleaned. Multiply your answer after you divide i into 7.000 and add 2 to it by $1.79. Sorry about the confusion.

12 years ago

This is not a website for getting answers. It is a website for getting help with problems you are having getting YOUR own answers.

12 years ago

Did you want the answer or do want to know how to do this?

12 years ago

the rule for multiplying when exponents are involved is to add the exponents for example, (2n)^3 (n)^5 = 2^3 * n^3 * n^5 = 8n^8

12 years ago

What do you think. If you post your answers, someone might tell you whether or not they are correct.

12 years ago

Opposite angles of a parallelogram have the same measure.

12 years ago

2^0 = 1 2^1 = 2 2^2 = 4 2^3 = 8 Does this give you a clue?

12 years ago

No. Add exponents when you multiply.

12 years ago

Multiply it out. (a + b)(a+ b)(a + b) (a^2 + ab + ab + b^2)(a + b) You can finish that, can't you?

12 years ago

Find the volume of the box. V = lwh

12 years ago

l = length w = 3/8 l A = lw 6 = l(3/8 l) Solve equation for l

12 years ago

You worked that correctly, but wrote down the wrong answer. Answer is 95 sq in

12 years ago

Test using the Pythagorean Theorem a^2 + b^2 = c^2 square each set of triples and see if they satisfy the rule

12 years ago

let x = cost of one pencil let y = cost of one pen 3x + 2y = 78 2 x + 3y = 72 Multiply first equation by 2 and second equation by 3 2(3x + 2y) = 156 3(2x + 3y) = 216 then subtract one of the new equations from the other new equation. This will enable you...

12 years ago

Parallel lines have the same slope. Perpendicular lines have slopes that are negative reciprocals of each other.

12 years ago

Not all parallelograms have four sides equal. I agree with you on A and D.

12 years ago

Yep. It's a rhombus. A rhombus is a special parallelogram.

12 years ago

It looks like the side of the larger square is a. The side of the larger square is b. Area of larger square = a^2 Area of smaller square = b^2 Area of remaining glass is a^2 - b^2 Factor thatbexpression

12 years ago

Volume of cylinder = area of circular base times height.

12 years ago

Correct.

12 years ago

That's the difference of two squares. (a+ b)(a - b) Remember?

12 years ago

The 4 angles of a trapezoid add up to 360. Since you give the measures of three of those angles, add then subtract to find the fourth angle.

12 years ago

Notice the difference between the outputs is 2. If you multiply the inputs by 2, it does not give the outputs. But each output is 3 more than what multiplying by 2 gives. So, the rule must be 2n + 3 Does this make sense?

12 years ago

What did you get when you added 86 + 41 + 133?

12 years ago

Something is wrong with the information you have given us. 100 does make the four angles add up to 360 but each pair of angles between the parallel bases has to add up to 180 and with this information, they do not. Are the parallel bases AB and CD?

12 years ago

Divide 360 by 18. Divide 360 by 5.

12 years ago

Do you know how many degrees are in a circle before it it cut?

12 years ago

If you divide that by 12, how many degrees in one of the 12 pieces?

12 years ago

So, each of the 12 pieces has 30 degrees. Now, if 7 pieces were eaten, how many pieces were left?

12 years ago

If each piece has 30 degrees, then how many degrees does 5 pieces have?

12 years ago

You are right!

12 years ago

My pleasure!

12 years ago

It cannot be a trapezoid!!!

12 years ago

Yes, I !!! To kids if I want to make a point. It is very difficult to help a student if the information provided is not correct.

12 years ago

I'm assuming this quadrilateral, ABCD is in a plane and not on a sphere. Given the information you have provided, the numbers 6 and 10 on two of the sides has nothing to do with the question. In EVERY quadrilateral, no matter the shape, the sum of the fou...

12 years ago

Not enough information.

12 years ago

Sure. What kind of help do you need?

12 years ago