What is the 13th term of the geometric sequence 7,21,63

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.