Question

Please help I have tried every single one of these equations and I cant seem to get it right.

The width of a rectangle is 4 less than one-half its length. If the perimeter is 70 cm, identify the equation for the problem, then use it to find the length.
Select two answers.

2(2l)+2(-4)=70
25 cm
2(l +1/2l - 4)=70
26 cm
2(l + 4l - 4/2)=70
21 cm
35 cm
2(2l)+2(4)=70

Answer 1

`he width of a rectangle is 4 less than one-half its length` translate this into math equation

Answer 2

the**

Answer 3

w= 1/2L?

Answer 4

hmmm there is a mistake
the width of a rectangle is `4 less than one-half` its length

Answer 5

oh sorry w=1/2l-4

Answer 6

alright and what's the equation we should use to find perimeter of rectangle ?

Answer 7

2(l +1/2l - 4)=70

Answer 8

I tried it but I cant get the right answer

Answer 9

alright no the original equation is \[\huge\rm P=2L +2w\] that suppose to be our 2nd equation replace p with given perimeter which is 70

Answer 10

and then use substitution method

Answer 11

substitute for l and w?

Answer 12

\[\rm\color{ReD}{ w=\frac{1}{2}L-4}\] first equation^\[\rm2L+2\color{ReD}{w}=70\]
2nd equation^
so replace w with first equation

Answer 13

2L+2(1/2L-4)=70?

Answer 14

correct solve for l

Answer 15

L**

Answer 16

ok one second:)

Answer 17

I got like 37.5...

Answer 18

looks like you did the same mistake i was doing few sec ago

Answer 19

show me how did you get that ?

Answer 20

haha okay at least i wasnt too far off

Answer 21

umm so I distributed the two and then added like terms which resulted in 2l+3-8=70
which turned into 2l=75 and then i divided...

Answer 22

and how did you get 3 there ??

Answer 23

well there is a mistake with distribution \[2(\frac{1}{2}L-4)\]
2 times 1/2l = ?

Answer 24

1

Answer 25

not just one oh well let me retype it
2 times 1/2L

Answer 26

I meant 1l

Answer 27

\[\rm 2l+2(\frac{1}{2}L-4)=70\]
\[\rm 2L+1L-8=70\]
you should get 1L instead of 3 now combine like terms that's it:=)

Answer 28

oooh okay. thank you so much!

Answer 29

np :=)) good work!

Answer 30

thank you! and thanks for being patient with me haha. @Nnesha

Answer 31

my pleasure!