Answer: 3/4
Step-by-step explanation:
The amount of work (or the rate) done by the first person is 1/21
r = 1/21
Answer:
If I remember correctly, right angles are 90 degree angles. So the answers would be A. B. and C.
Step-by-step explanation:
If you see the little box on the angle, that means it's a 90 degree (right) angle.