23.) Would be B.
Explanation: You have to use the Pythagorean Theorem (a^2 + b^2 = c^2) but a bit differently. You have your A which is 6 and you have your C which is 14. Now all you have to do is 6*6 and 14*14
6*6=36 and 14*14=196
Now your problem will look like this 36 + b^2 = 196
Subtract 36 from 196
196-36=160
so all that is left is b^2 = 160
All you need to do is square root 160
√160 = 12.6
24.) Answer is H
Explanation: Same as above except you are finding c^2.
You want to do 20*20 and 15*15
20*20=400 and 15*15=255
Add them together
400+255=655
and square root 655
√655 = 25.5 (round down to 25)
26.) Answer is 8.
(You do it just like 23)
Note: Photo attached to help~