Answer: 21/40
Step-by-step explanation:
I did the test
Work shown above! Box a is 240 lbs Box b is 120 and Box c is 150 lbs hope this helps c:
(m-21) (m+1)there I thinks it's right unless I messed up my work
Answer:

Step-by-step explanation:

The sum of all 3 angles is 180 degrees, you should be able to solve from here.