Find the lowest common denominator and solve 21/3 - 14 1/5

A. 7
B. 14 3/15
C. 21 5/15
D. 7 2/15

The spotter on the ground is standing beneath the safety net. what is his distance from the base of the platform, to the nearest meter? 3 meters, 2 meters, 4 meters, 1 meter?

How do i simply this radical expression?

The table below shows the angle measurements for triangle abc and triangle xyz. if triangle abc is similar to triangle xyz, what does angle z equal, in degrees?