Which is a substance made up of only one kind of atom?

Find the sum of X + y, when x = 3.1, and y = 5.4

Greg needs a rectangular piece of plywood with an area of 18 square feet. The length of the cardboard is five less than two times the width. What is the width of the rectangle.

In a group of 84 kids 3/7 brought their lunches of those who bought their lunches 9 got a slice of pizza what fraction of the students who bought their lunches got a slice of pizza

Lianne charged twice as much to walk a large dog than she did to walk a small dog. This week she had time to was 10 small dogs and 5 large dogs, and she wants to make $100. How much should she charge per small dog? Per large dog?

How do you solve 8 (t+2) - 3 (t-4) = 6 (t-7) = 8

Vince has 16 beads how many different arrays can vince draw to represent the total numbers of beads he has

What is 29 decreased by 20

Use the identity property of multiplication to write an expression equivalent to 90•1

There are 12 boys and 8 girls in a class. If 2 more girls join the class, what is the new ratio for the number of boys to the number of girls in the class?

How do you write (6) ^-2 without exponents?