Finding a closed-form expression for a sum.
What happens as n goes to infinity?
Geometric series in general The sum of a series is defined as a limit of partial sums, which means that when the ratio r satisfies −1

Find the x-intercept and y-intercept of the line. 3x + 5y = −15

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?