The red line and the blue line trains just arrived at the the station when will they arrived at the next station at the same time? red line = 8 minutes blue line = 10 minutes

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

Combine like terms to make a simpler expression 3z+z