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Mathematics 10 Online
OpenStudy (emmynimmy):

A rectangular picture frame has a perimeter of 70 inches and a width 3 inches shorter than its length. Find the area of the picture frame.

OpenStudy (emmynimmy):

it is going to be the answer with inches squared

OpenStudy (emmynimmy):

jhonyy9 (jhonyy9):

perimeter = 70 inches w=l-3 yes ?

jhonyy9 (jhonyy9):

what is formula of perimeter of a rectangle ?

OpenStudy (emmynimmy):

P=2(l+w)

jhonyy9 (jhonyy9):

exactly please rewrite it using w=l-3

OpenStudy (emmynimmy):

70=2(l+3)

OpenStudy (emmynimmy):

idk

jhonyy9 (jhonyy9):

P = 2(l+w) P = 2(l+l-3) continue it please

OpenStudy (emmynimmy):

idk

jhonyy9 (jhonyy9):

why not assum the l+l inside parentheses

OpenStudy (emmynimmy):

i don't know how to solve

jhonyy9 (jhonyy9):

how many is l+l = ?

OpenStudy (emmynimmy):

2

jhonyy9 (jhonyy9):

2 what ?

OpenStudy (emmynimmy):

2I

jhonyy9 (jhonyy9):

l mean length

OpenStudy (emmynimmy):

2 L

jhonyy9 (jhonyy9):

yes 2l P = 2(2l -3) distribute the parentheses

jhonyy9 (jhonyy9):

P = 2*2l -2*3

OpenStudy (emmynimmy):

p=4l-6

jhonyy9 (jhonyy9):

yes but you know that p=70

jhonyy9 (jhonyy9):

so how can you rewrite it using this p=70

OpenStudy (emmynimmy):

70=4l-6

jhonyy9 (jhonyy9):

yexactly and from this equation you can calculi easy the value of l yes ?

OpenStudy (emmynimmy):

sure

jhonyy9 (jhonyy9):

and than you know the value of l so you can calculi easy the value of w

OpenStudy (emmynimmy):

ok so what would my answer be

jhonyy9 (jhonyy9):

please calculi the l

jhonyy9 (jhonyy9):

bc. you know that area of a rectangle you get than you multiplie the length by width

jhonyy9 (jhonyy9):

70=4l-6 l = ?

jhonyy9 (jhonyy9):

@emmynimmy you dont like ending this ?

OpenStudy (emmynimmy):

i got it, it was 304

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