Convert 8.45km to metres.

How many times larger is 9 × 10^8 than 3 × 10^-5? a. 3 × 10^13 b. 3 × 10^-40 c. 3 × 10^-13 d. 3 × 10^3

Allen wants to buy a hover board that sells for $249.99 and a helmet that is $36.54. how much change will allen receive if he gives the cashier three $100.00 bills?

Alice is paying her bill at a restaurant. the tax on the cost of her meal is 5%. she decides to leave a tip of 20% of the cost of the meal plus the tax. write an expression for her total bill if the cost of her meal is m dollars. write your answer in simplified form.