Give a recursive definition for the set Y of all positive multiples of 9. That is, Y = {9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, ... }. Your definition should have a base case and a recursive part.

Describe how you can use compatible numbers to estimate 17 x 27

A 30°-60°-90° triangle has a hypotenuse with a length of 10. What is the length of the longer leg of the triangle? A. 5 B. 5 square root of 3 C. 5 square root of 2 D. 20

The value of Maggie's car decreased 30% since last year, when she bought it. If the car is now worth $22,000.00, how much was the car worth when she bought it?

There are 40 nickels in every standard coin roll, what is the constant of proportionality

The difference between consecutive perfect square numbers is always odd. True or false?

One out of 42 high school ball players plays college ball. One out of 25 college players plays professional ball. What fraction of high school players plays professional ball?

2. The numbers 1 through 50 are written with red marker on slips of paper while the numbers 51 through 100 are written with blue marker on slips of paper. All the papers are put into a bag and shuffled. One card is randomly selected.

12 out of 15 as a percent, a decimal and a fraction

Make sure it's fully reduced. 2 - x = 5/8

A book store is having a sale. The book Bart wants was originally priced at $14.99. The book is now $10.04. By what percentage was the price reduced?