Use mental math to solve the problem.

Mario sold his old skateboard for $45. If he buys a

new skateboard for double the price that he sold

his old one, how much did he pay for his new

skateboard?

Assume that Jill deposits $20,000 in cash into her checking account at Welcome National Bank and the central bank has set a required reserve ratio of 10%. A. Explain the immediate effect of her deposit on the M1 measure of the money supply. B.

Alex drives at an average speed that is 3/4 of the average speed that Roy's train travels. Alex takes 40 minutes to travel 65 km in her car. Roy travels for 1 hour and 15 minutes on his train. How far does Roy travel to 2 dp?

The probability of rolling any number on a die is 1/6. If you were to roll a die 5 times in row and each time you rolled an even number what is the probability of rolling an even number on the next roll?

A group of 140 tourists are going on a tour. The tour guide rents 15 van. Each van hold 9 tourist

Find the are of each rectangle with the given base and height. 4ft, 4in.

How do you calculate a net worth statement? A. Assets+Liabilities B. Assets-Liabilities C. Assets / Liabilities D. Assets x Liabilities

It is clear that a large survey is an appropriate method for a study of marriage patterns among college students. What will the researcher need to do to insure that the research sample is random?

What is the volume of a cylinder, in cubic feet, with a height of 16 feet and a base diameter of 6 feet?

Wei-Min makes a square quilt that has an area of 100 square feet. It has 25 square blocks, each the same size. What is the length of each side of a block?

A rectangle has side lengths of 1 3/4 feet and 2 1/3 feet. Find the perimeter of the rectangle. Write your answer as a mixed number in simplest form.