8. which of the following is true of the commutative property under subtraction? a. 10 – 9 = 10 – 9 b. 10 + 9 = 9 + 10 c. 10 – 9 = 10 + 9 d. 10 – 9 ≠ 9 – 10

The highest common factor of 132 and 220

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.