Please help on numbers 4 and 5 will give brainliest.

Sketch one cycle if the cosine function y=2cos2theta

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.