What digit makes 2530 divisible by 9

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?