Y=arctan(-4x) evaluate dy/dx at x=3

Bugs bunny was 33 meters below ground, digging his way toward pismo beach, when he realized he wanted to be above ground. he turned and dug through the dirt diagonally for 80 meters until he was above ground

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?