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The 1st, 5th and 13th terms of an arithmetic sequence are the first three terms of a geometric sequence with a common ratio 2. If the 21st term of the arithmetic sequence is 72, calculate the sum of the first 10 terms of the geometric sequence.

Chapter 27, lesson 5 problem solving: use formulas

In a class of 60 students, 4/5 are members of Math Club. Among the members, 3/5 are girls. How many boys are members of Math Club?

My answer is 12276, is this correct?

the sum of the first 10 terms of the geometric sequence.

Nope

Given the following data sets, determine the range, variance, and standard deviation