Cathy saved $320 last month. this month, she saved $377.60. what is the percent increase for the amount of money cathy saved?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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.

Me n o w. i need t h i s. 10 points