You are ima room with other students and are asked to get in groups of 3. When finished, there are 21 groups of 3. How manny students are in the room?

Corresponding sides of similar triangles are A opposite B proportional C equals

When two pipes fill a pool together, they can finish in 4 hours. If one of the pipes fills half the pool then the other takes over and finishes filling the pool, it will take them 9 hours.

Which is the right answer because i am in the middle of two and can not dicide which to chose

What is the value of the 6 in the umber 6,345

Write each fraction as a decimal

Assume that adults have IQ scores that are normally distributed with a mean of 107 and a standard deviation of 15. Find the third quartile Q3 , which is the IQ score separating the top 25% from the others.

If there are 2 blue balls and4 green balls how many balls are there

In how many ways can you make $.80 in change without using pennies or half-dollars

8.85 to the nearest tenth

1) 2x+8y=20 y=2 2x+8 (2) = 20 2) x=5 2x+y=10 2 (5) + y=10 3) 5x-2y=3 y=2x 5x-2 (2x) = 3 4) 2y+x=-15 x=3y 2y + (3x) = - 15 5) 4x+7y=19 y=x+9 4x+7 (x+9) = 19 6) y=6x+11 2y-4x+14 2 (6x+11) - 4x+14 7) 2x-8y=6 y=-7-x 2x-8 (-7-x) = 6 8) x=2y-1 3x-2y=