What does x mean in a math equation

Express the height of the following rectangular prism in meters. (Note: 1 m = 100 cm) 750 m 7.5 m 7,500 m 0.75

What is the greatest common factor of 3x^2-9x

Evaluate r2h for = 3.14, r = 1 and h = 2

Suppose that a cell phone monthly rate plan costs the user 5 cents per minute beyond a fixed monthly fee of $20. This implies that the relationship between monthly cost and monthly number of minutes is linear.

In a group of 1,200 people 252 have blue eyes, 132 have green eyes, and 348 have black eyes. What is the probability that a person chosen at random from this group has blue eyes?

Shannon is a nurse. Her regular rate is $28 per hour. She is paid double-time (two times the hourly rate) for holidays. During one week, she worked 40 regular hours plus 4 holiday hours. Find her total earnings for the week.

Macy is making a border out of strips of wall boarder placed end to end along the 12-foot wall in her room. Each strip is foot long. How many strips of wall border will Macy need?

What is the square route of 20?

How long did it take Carson to travel 10 miles at 35 miles per hour? (round to the nearest whole number.)

Find the value of the given expression 1/2[4+6 (60 (-12)) ]