Select the correct answer. The perimeter of a rectangle is 42 inches. If the width of the rectangle is 6 inches, what is the length?

A 12 inches
В.15 inches
c. 21 inches
D.40 inches

Length = 15 inches

Step-by-step explanation:

Here we are given the width and the perimeter of the rectangle and we are required to find out our length. We will use the formula of perimeter in order to find the length.

The formula for perimeter

P=2(l+b)

where

l is length

b is width = 6

P is perimeter = 42

substituting them in formula we get

42=2(l+6)

dividing both sides by 2 we get

21 = l + 6

subtracting 6 from both sides we get

15 = l

Hence length is 15 inches

51840000 cm 2

step-by-step explanation:

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct