3. Mary bought a pair of speakers for $400. The following year, her friend bought the same speakers for $310.

What is the percent decrease in the price of the speakers?

A

225%

B

22.5%

C

77.5%

D

2.3%

The sum of three interior angles of a triangle is 180degrees. Suppose one angle is 90degrees and the remaining two angles are the same measure. Find the measures of the angles algebraically. Let one of the unknown angle measures be x.

Louisa states that the solution to the equation 1/4x - 3 = 3/8x + 4 is x = 56. She verifies her solution using the steps below.

Which translation maps the graph of the function f (x) = x^2 onto the function g (x) = x^2+2x+6 A. Left 1 unit, up 5 B. Right 1 unit. Up 5 C. Left 2 units. Up 2 D. Right 2 units. Up 2

Some kangaroos can jump over 30 feet in one jump! if a kangaroo could jump like that 150 times in the row, how much farther would it need to go to cover a mile?

34 = 6d - 8 I do not get how to solve this in a simple way

Which is the best buy ... 40 bottles of water for $5.49 or 72 bottles for $9.00

Solve for the variable in this equation. 1/4 (2x - 12) = 2/3 (3x + 9)

Enter the degree of the polynomial below. 5x^5+8x^2+2x-3x^9-8x^4-4x^5. A. 8 B. 9. C. 6 D. 5.?

The roof is 8 feet above the floor. To support it, John needs 2 sets of metal bars. If each set has 7 metal bars, how many metal bars are there in all?

The length plus the width of a rectangle is 10 . Let x represent the length. The equation for the area y of the rectangle is y = x (10 - x).