Question

A rectangle has a width of 7.9 ft and a perimeter of 27.2 ft.



Enter the length of the rectangle, in decimal form, in the box.

ft

Answer 1

do you know the formula for the perimeter of a rectangle ?

Answer 2

nope

Answer 3

can you look it up and post it here ?

Answer 4

p=2(1+w)

Answer 5

you mean
p= 2(L+w) (not 1)

next, you can replace the letters with numbers
they tell you what "p" is (p stands for perimeter)
and they told you W
can you fill in the numbers ?

Answer 6

p=2(l+7.9)

Answer 7

yes , but you can also replace p (perimeter)
what do you get ?

Answer 8

27.2= 2(L+7.9)

now divide both sides by 2
on the left side you get 27.2
on the right side 2/2 is 1 (so we can ignore it)
we get
13.6= L+7.9
last step: add -7.9 to both sides

Answer 9

ok
you get 27.2=2(1+7.9)

Answer 10

oh

Answer 11

yes

Answer 12

won't let me paste my answer XD

Answer 13

13.6+-7.9=5.7

Answer 14

yes, OS is a pain today. I have to refresh the page
but it looks like this
13.6= L+7.9
13.6 - 7.9= L+7.9-7.9

notice we keep the L and just "add on" -7.9 to both sides
now simplify. we know 7.9-7.9 is 0 on the right side

Answer 15

ok

Answer 16

and as you posted , after simplifying
5.7= L
or
L= 5.7
the answer!

Answer 17

thank you, can you help me with one more and check some of my other questions?

Answer 18

one more. can you make a new post please?

Answer 19

ok