Every 3rd person at a concert receives a free t-shirt. Every 10th person receives a free keychain. Which person will be the first to receive both?

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=