Question

Stuck on another problem. Not sure what to do with the formula :/ A trapezoid has an area of 166.5 in.², a height of 9 in., and one base measuring 15 in. What is the length of the other base?

Answer 1

Tried using the formula but I keep getting stuck

Answer 2

A= 1/2h(b1+b2)

Answer 3

Then I came up with 166.5 in^2 = 1/2(9)(15+ b2)

Answer 4

So 166.5=4.5(15+b2)

Answer 5

Then what do I do from there :( that's where I'm getting stuck

Answer 6

I would say distributive property?

Answer 7

Or divide both sides by 4.5 to give you:
37=15+b2
Subtract 15 from both sides to get b2 by itself:
b2=12

Answer 8

@chrismoon Didn't think of that! That's a good idea.

Answer 9

Thank you! :) I didn't think of doing it that way cause I thought it wouldn't work

Answer 10

uh oh lol I just checked the answer choices and I don't see 12
3.5 in.
7 in.
18.5 in.
22 in.

Answer 11

22 in.

Answer 12

Thank you :)

Answer 13

@chrismoon
Or divide both sides by 4.5 to give you:
37=15+b2
Subtract 15 from both sides to get b2 by itself:
b2=12
Correct work wrong answer!
b2=22
37-15=22!

Answer 14

Oops, my fault. Must've plugged something into the calculator wrong.