Determine whether the following graph represents a function

What is the length of the unknown leg in the right triangle ?

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

Which point lies on a circle with a radius of 5 units and center at p(6, 1)?