6*10^-2 is how many times as 2•10-8

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

Jacks bank statement shows an account balance of -$25.50. which describes the magnitude, of size, of the debt in dollars

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?