The mean of this set of numbers

{20, 30, 40, 50, 60, 70, 80} is?

Type of percentage that compares the final and original amounts

Five athlete are entered into a competition. Four of the athlete have had their turns. Their scores are 9.8 seconds, 9.75 seconds and 9.81 seconds to run 200 m distance. What score must the last athlete get in order to win the competition?

What is bigger 4.17 or 4.085

A truck is 75% longer than the car. A bus is 30% longer than the truck. How long is the car is the bus is 40 feet long?

Solve using the quadratic formula: 2x^2+10x+15=0

Each time Nicholas mows a lawn he uses 1/6 of a gallon of gasoline. If he has 2/3 of a gallon of gasoline, how many lawns can he mow before he needs to buy more gasoline

Which compound inequality can be used to solve the inequality. |3*+2| >7

How can 2x^2=x^2+4x+8 be set up as a systems of equations

Which statement best describes the excluded values of a rational expression? A - The number of excluded values of a rational expression cannot exceed the degree of the numerator.

Evaluate 12C4 and 11P4