The two figures are proportional. find the value of x.
36in
x
12in
10im

When you answer this can you explain

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

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.