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|dw:1439948377100:dw|

hint:
4(side) = perimeter

4+3=7?

side = ?

not getting you here?

what is the length of one side? look at the diagram...

(7x+3)in

right, and perimeter = ?

208in

good, so plug side and perimeter into the equation
4*(side) = perimeter

28+12 then =

40

not quite... you're forgetting the x

4(7x+3) = ?

40X

nope, still not quite right...

4(7x+3) = 4*(7x) + 4*(3) = ?

12

again, you're forgetting the x...
4*(7x) = __?

18x

28

yes

4*7=28 4*3=12 28+12=40 but that isnt it what am i doing wrong

yes

28

12

Do you know what our next step is for solving 208 = 28x + 12?

40 thats what i put up there

208=40

Not quite. We have to use the order of operations and all that jazz

ohhhhhh

16

So, we have
208 - 12 = 28x + 12 - 12
208 - 12 = 28x
Can you tell me what is 208 - 12?

oh

thanks. :)

Ah, right :) No problem. x = 7