Question

the length of a rectangle is three times its width. if the perimeter of a rectangle is 40m find its area

Answer 1

2(3x + x) = 40
Solve for x then plug it in here:
A = 3x^2

Answer 2

so if 2 times 3 equals 5x what do i do then?

Answer 3

oh wait x equals 10

Answer 4

What? how did you get that?
2(3x + x) = 40
2(4x) = 40
8x = 40
x = 5
Can you finish up?

Answer 5

i thought we had to distribute first but ok so 3x5x2= 30?

Answer 6

It doesn't matter which you do first.
2(3x + x) = 40
6x + 2x = 40
8x = 40
x = 5
Then, plug it in:
\[3x^2 \implies 3(5)^2 \implies ?\]

Answer 7

75?

Answer 8

Yup :)

Answer 9

thank you!

Answer 10

np :)