The grades received on a test by twenty students were 100, 55, 75, 80, 65, 65, 95, 90, 80, 45, 40, 50, 85, 85, 85, 80, 80, 70, 65, and 60. What is the average of these grades?

A.) 70.5

B.) 72.5

C.) 77

D.) 80.3

E.) 100

For each ordered pair determine whether it is a solution to the system of equations -2*+7y=3 5*-3y=7

Amy has 20 coins in her bank. The coins are all dimes and quarters. The total amount of money in her bank is $4.25 how many of each coin does she have?

Peter started with 100 dollars in his bank account. Each month, he puts 20 more dollars in his account. The amount of money in dollars D in his account is given by D = 20m + 100 where m is the number of months he has added 20 dollars to his account.

A pair of shoes usually sells for $55. If the shoes are 40% off, and sales tax is 7%, what is the total price of the shoes, including tax?

With direct variation, if you increase the input, the output O A. remains the same B. decreases proportionally O C. increases proportionally O D. decreases exponentially

Geometry express the area of a square with sides of length 5ab as a monomial

Jon wrote the expression shown. -4x+3+5x-1 Write the expression that is equivalent to Jon's using the fewest number of terms possible.

When testing μ, how do we decide whether to use the standard normal distribution or a Student's t distribution? If the x distribution is normal and n ≥ 30 with known σ we use the Student's t.

What is - 90>-5 (k-3) ?

How to simplify the expressions of 5p-5-10-2p