Why is the product of a rational number and an irrational number irrational?

The measure of angle X is 18 more than three times the measure of its complement. Find the measure of angle X.

One landscaper works 1.5 times as fast as another landscaper. Find their individual times if it takes 9 hours working together to complete a certain job.

Is 10/40 7/21 13/26 or 3/18 equivalent to 5/15

Why is 4:6 equivalent to 2:3

What multiplies to be - 63 and adds up to be - 2

A hot air balloon rises at a rate of 38 km/h and starts at the height of 60 km. Another balloon started from the ground and is rising at the rate of 50 km/h. At this rate what height will they be at when they are at the same height?

Factor sec^2x-secx+tan^2x

john is packing a box that is shaped like a cube and has an edge that is 25 centimeters long how much space is available in the box

A student has a container with a volume of 1.5 liters. She estimates the volume to be 2.1 liters. By what percent is the student's estimate off? (Round to the nearest percent as needed.)

Multiply the polynomials. (8x2 + 6x + 8) (6x - 5)