Question

Find the area of a rectangle if the perimeter is equal to 38 in and the length is 10.

Answer 1

u must find its width, first

Answer 2

how do u do tht

Answer 3

do u know formula of the perimeter a rectangle

Answer 4

no can you please tell me

Answer 5

perimeter = 2(l+w)
with l=length, w=width

Answer 6

so, u can make an equation :
2(10+w) = 38
solve for w

Answer 7

so it will be 2(9.5+10)= 39

Answer 8

nopes.. it should be 2(10+w) = 38
now, solve for w

Answer 9

w=18

Answer 10

nopes..
2(10+w) = 38
both sides divided by 2, what u get ...

Answer 11

2 * 10 + w = 38
20+w=38
w=18

Answer 12

no, if u want multiply in bracket by 2, u must use distributive property :
a(b+c) = a*b + a*c
so, 2(10+w) = 2*10 + 2w = 20 + 2w

Answer 13

now, u have 20+2w=38

Answer 14

but that is not one of the choices I have on my homework

Answer 15

yeah, because this is not clear. after u found the velue of w, next u can determine the area by using the formula A=l*w

Answer 16

80?

Answer 17

90*

Answer 18

well, look this :
20 + 2w = 38
move 20 to right side, becomes
2w = 38-20
2w = 18
w = 18/2 = 9
so, the area (A) = l * w = 10 * 9 = ...

Answer 19

yup its 90 thank u so much

Answer 20

yup, very welcome