POINTS GIVEN HELP ME PLS POINTS WILL BE GUVEN

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Evaluate cos2θ for cosθ = square root of 3/2

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?