Maria spend 5 hours studying and earned a 90 on her exam. If you want to score a 81, how much time do you need to spend studying?

Scores on a test have a mean of 70 and a standard deviation of 11. Michelle has a score of 48. Convert Michelle's score to z score.

The mean hourly salary of the 10 employees at a fast-food restaurant is $8.25. One of the employees earning $6.50 an hour leaves the company, and another employee is hired at $5.50 an hour. What is the new mean salary of the employees?

Y = square root of x, dx/dt = 12, find dy/dt when x = 9

What is the absolute value of - 4/5,1/2,0.2, and - 0.5

Consider the differential equation y'' - y' - 12y = 0. Verify that the functions e-3x and e4x form a fundamental set of solutions of the differential equation on the interval (-[infinity], [infinity]).

The expression 15.85 (1+x) gives the total cost of a toy, where x is the sales tax percent written in decimal form. What does 1 + x represent in the expression? amount of tax percent of tax percent of original price paid including tax cost of toy

When you buy a dozen bagels for $2.39, you get an additional bagel free. What is your cost per bagel?

London purchased 4 3/4 pints of ice cream for a party. If each guest will be served exactly 2/3 pint of ice cream, what is the greatest number of guests that London can serve?

If A = (4,-5) and B = (7,-9), what is the length of AB? A. 5 units b. 6 units c. 7 units d. 8 units

The sum of 9 times a number and 5 equals 2