Mrs. Math offers help with math homework. She will do up to 10 problems for a charge of $10, if she works 10 problems but no more than 20 problems she charges $20 and if she works 20 or more problems her fee is $40.

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters .

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

Choosing a booth location: your manager is sending two people to work at the conference. she wants a booth that will give your company good visibility for no more than 35% of the total budget ($3000). the conference coordinator just told you there are only five booths left. which booth will you choose? write the inequality that shows how much money you can spend on the booth simplify the inequality that shows how much money you can spend on the booth.