Difference between Arctan and arctan

At he grand opening of a new store every 9th customer will receive a balloon and every 12th customer will receive a $10 gift certificate which customer will be the first to get both a balloon and gift certificate

A health club charges $35 a month for membership fees. Determine whether the cost of membership is proportional to the number of months. Explain your reasoning

Suppose a population is known to be normally distributed with a mean, μ, equal to 144 and a standard deviation, σ, equal to 27. Approximately what percent of the population would be between 144 and 171?

Find the area of a regular octagon with apothem k and side of 10

The prices of several chairs are 89,76,81,91,88 and 70. what is the mean of the chair prices

A glider flies8 miles south from the airport and than 15 miles east. Than it flies in a straight line back to the airport. What was the distance of the gliders last leg back to the airport?

A store has 30 boxes of melon each box has 4 bags each bag holde 2 melons what is the total number of melon in the store?

Two times the number of Windows

Simplify the expression below. -5 (2x - 1) + 3x

Are all cubes congruent