Mr. Jefferson has 20 students in his class. He wants to send 4 of these students to pick up books for the class.

How many combinations of 4 students can he choose?

A.

5

B.

80

C.

4845

D.

116,280

What is 9+10? A) 910 B) 21 C) 19 D) 90

During his tennis career in singles play, John won 4 fewer tournament A titles than tournament B titles and 2 more tournament C titles than tournament B titles. If he won 13 of these titles total, how many times did he win each one?

Tickets for the baseball games were $2.50 for general admission and 50 cents for kids. If there were six times as many general admissions sold as there were kids tickets, and the total receipts were $7750, how many of each type of ticket were sold?

Is 7.031 greater than 7.03

Which expression is equivalent to tan (-x) cos2x? A. - sin xcos x. B. sin xcos x. C. tan x + sin2x. D. tan x - sin2x. E. - tan x - sin2x.

A pool table supply company is making a cardboard box to package new cubes of pool cue chalk. Each cube of chalk is 1 cubic inch. The company considers all the ways to arrange 16 cubes of the chalk.

About 13 out of 20 homes have a personal computer. On a street with 60 homes, how many would you to expect to have a personal computer?

There are 7 red, 8 green, and 6 blue marbles in bag. Kate is going to select one marble at random. What is the probability that she will select a green or blue marble?

And above swimming pool is leaking after 1/2 hour the pool has leak 7/8 gallons of water how many gallons of water per hour is the swimming pool leaking

Express this phrase as a unit rate: 10 1/2 teaspoons in 14 ounces