Question

what is AC? A) 144 (B) 136 C) 108 D) 128

Answer 1

The triangles are similar. Does that help?

Answer 2

yea but i dont know how to solve !:(

Answer 3

What proportion did you write?

Answer 4

x/7= 84/156-x

Answer 5

What side corresponds to 84?

Answer 6

opposite

Answer 7

84 is the short leg of the big triangle. What is the short leg of the little triangle?

Answer 8

no ! 7 sorry

Answer 9

Then 84 and 7 are corresponding sides. If you have 7 as the denominator of one fraction, you should have 84 as the denominator of the second fraction.

Answer 10

ok?

Answer 11

Well then rewrite your proportion incorporating the fact that you just learned.

Answer 12

i am .. on paper hold on

Answer 13

so 156-x/84= x/7

Answer 14

?

Answer 15

yes

Answer 16

ok let me solve

Answer 17

More precisely:
(156-x)/84=x/7

Answer 18

i got 84x=1092-x

Answer 19

Solve that equation.

Answer 20

ok

Answer 21

84x2-1092 ???

Answer 22

\[\frac{156-x}{84}=\frac{x}{7}\]

Answer 23

\[7(156-x)=84x\]

Answer 24

\[1092-7x=84x\]

Answer 25

do i cancel out the x ?

Answer 26

\[1092=91x\]

Answer 27

\[\frac{1092}{91}=\frac{91x}{91}\]

Answer 28

Perhaps you can finish it.

Answer 29

i got 12 but it does not match to any answer choices?

Answer 30

You got 12 for what?

Answer 31

x i devided 1092 into 91

Answer 32

You divided 91 into 1092 and got x = 12
Does the problem say "solve for x" ?

Answer 33

no itsays find AC ... flutter im lost

Answer 34

so how do i find AC?

Answer 35

What is the length of AC as printed in the problem?

Answer 36

i got 144!! i replacedd x with 12

Answer 37

perfect!!

Answer 38

thank u ^.^

Answer 39

yw