(6) In 2018, the initial bee population in a hive was 1, 120 and decreased exponentially at a yearly rate of 1.5%. (a) Find the size of the bee population in year 2030. (b) In what year will the population halve? (7) For the function f(x) = 7 cos(3x-π/2), find the amplitude, period and phase shift. Draw the graph of f(r) over a one-period interval and label the amplitude and period. (8) Solve the following inequality. Please present your answer in interval notation. x²-2x+1/ x^2-9 ≤O