Penny had $117, which is 9 times as much money as Kari had. How much money did Kari have?

How do you do 19 / 516

For every 60 phone calls that Linda made in a month, she received 70 phone calls. What is the ratio in simplest form of the number of calls made to the number of calls received by Linda that month?

What would this problem be factored to? a^2-b^2

Simplify - 80 over - 20

Given f (x) = - x - 1, find f (5).

0.884 in standard form

Write a function that represents a parabola that opens upward and has a vertex of (9,11)

A local gaming club has more than 2 but fewer than 20 members. Every member of the group purchased a signed copy of the latest book from the legendary Dumas, for a grand total of $299.

When a number is decreased by 20% of itself, the result is 72. What is the number?

How many strings of 12 decimal digits begin with "248" or consist only of even digits?