The johnson's pay $9.95 a month plus $.035 per min for local phone service. last month, they paid $12.75. how many minutes of local calls did they make?

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

In the diagram of circle o, what is the measure of zabc?