Simplify the expression. 3a-9b

Gemma has 6 games. Chris has 13 games. How many fewer games does Gemma have than chris?

Assume that 28 take mathematics, 28 take psychology, and 13 take mathematics and psychology. How many students take exactly one of these two courses

32 + 6 * 22 - 42 : 23

Solve by elimination: 3x+7y=23 -3x-7y=-17

the speed of light is approximately 3 x 10 to the 8th power meters per second, while the speed of sound is approximately 3.4 meters per second. How many times faster is the speed of light than the speed of sound?

What polynomial should be subtracted from 7x^2-6x+5 to get the difference equal to x^2-x.

Hi how are you how do i get the answers for my self because i am a teacher and get just the test with out the answer on them for the students

Line A is perpendicular to Line B. If the slope of Line A is - 5/8 what is the slope of Line B?

Ellen Newman has an income of $18,150 and claims 5 exemptions. The amount allowed for each exemption is $1,000. Her state tax is 5%. How much state tax must be withheld this year?

8 piglets are evenly sharing 5 liters of milk. How many liters of milk should each piglet get?