(B) In the graph for the question 10, W(t), the water level at time t, is a
cosine function with amplitude 6 ft and period 12 hr:Hence, .(C) Solve the differential equation , getting . Use x = −1, y
= 2 to determine .(D)(A)(B) G′(2) = 4, so G(x) 4(x − 2) + 5.