Question

If CA = 42 cm, find CB.

(Points : 1)
12 cm

15 cm

18 cm

36 cm
****** my answer is 18 is that correct

Answer 1

yes, that looks correct

Answer 2

Given: No Image

Find RQ.
0 (Points : 1)
17 cm
18 cm
25 cm
20 cm

*** this one total confused me i have no idea

Answer 3

So the reason this one seems harder is because we don't know the length of PR right?

Answer 4

yea and all the extra lines

Answer 5

So, I think what we can do here is say that the PR = x + 5 since that must be the total length.

Answer 6

Then, you can set up the proportion
\[\frac{16}{20} = \frac{x}{x+5}\] and solve for x by cross multiplication.

Answer 7

but lemme check and make sure that works...

Answer 8

okay

Answer 9

yes, it appears that that will give the answer. Do you have any questions about the setup?

Answer 10

yes, how do you solve for it? I plugged it in and got 4 i did 16 times 5 then 80/20

Answer 11

OK, so you should first get
\[16(x + 5) = 20 x\]

Answer 12

does that make sense for the first step?

Answer 13

yes

Answer 14

OK, so then you get
\[16x + 80 = 20 x\]
so that becomes (like I think you said)
\[80 = 4x\]
divide by 4 and you get
\[20 = x\]

Answer 15

OH okay that makes sense thank you

Answer 16

no problem, good job!