How to find the points?

Show all work. 7. Naturalists find that the populations of some kinds of marine animals vary periodically. Assume that the population of dolphins in a certain ocean varies sinusoidally with time. Records started being kept when time t = 0 : years, in the year 2000. A minimum number, 100 dolphins, occurred when + = 2 years. The next maximum, 800 dolphins, occurred at + = 12 years. a. Sketch a graph of this sinusoid. (Label all important values) .b. Write an equation expressing the number of dolphins, d, as a function of time, t. c. How many dolphins will there be in 2023? d. In what years were there only 200 dolphins? *100 + 800 goo = 450 Z min = 100 max = 800