1. If scores on an exam are normally distributed with a mean of 80% and a standard deviation of 10%, what would a score of 90% be in Z-scores (e. g., how many standard deviations is this score above or below the mean) ?

Solve for y. - 2x+2y=-56

Review the expression below - 2 (a+b-5) + 3 (-5a+2b) + b (6a+b-8)

The range of f (x) = 6•3^x is all positive real numbers. true or false

Rahul needs 3 litres of water in a jug. I have measuring cups of 1/2 and 1/4 litres only, how many cups of 1/2 litres or 1/4 litres will Rahul need to fill his jug of water?

The students in a class of 24 share 48 apple slices and 36 orange slices equally among them. How many pieces of fruit did each student get?

What is the answer to 3n + 3 = 27

The mean of 3 consecutive terms in an arithmetic sequence is 10, and the mean of their squares is 394. What is the largest of the 3 terms?

A race at travels at a rate of 205 mph how far would it travel in 3 hours?

What is 8/20 of an hour

An actor invests some money at 9 % simple interest, and $24,000 more than three times the amount at 10 % simple interest. The total annual interest earned from the investment is $38,670. How much did he invest at each amount? Use the six-step method.