What function is used to find angle measures using the trigonometric ratios? * HELP FOR A FINAL ASAP

Customers at an ice-cream shop took a survey .the results showed that 144 customers rated the shop as being "very satisfactory ."this number represented 45%of the total nunber of customers who took the survey

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.