Question

1 The length of a rectangle is 10 inches, and the

width is represented by 3x. Which best
represents an equation and solution for x if the
area of the rectangle is 40 square inches?
A 10(3x) = 40; X = 4
B 30x = 40; x = 1;
C 3x = 40; x = 13
D 3x + 10 = 40; X = 10

Answer 1

A

Explanation:

To find the area of a rectangle, it is length times width (10*3x), and if it equals 40, you could just write that after the equation, and then find out that "x" would equal
`(4)/(3)`

Answer 2

30x = 40 ; x ≈ 1

Explanation:

`A^{}` =
`l^{}`
`w^{}`

`l^{}` = 10 inch.

`w^{}` = 3x

10(3x) = 40

30x = 40 ; x =
`1(1)/(3)` ≈ 1