Need help please on this question

Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Nine more than four times a number is the same as one less than twice the number. find the number?