If Alfonso has 9 quarters and nickels in his pocket, and they have a combined value of 145 cents, how many of each coin does he have? PLEASE HELP THANK

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

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

Identify the number as a rational or irrational.explain. 127