-6x -4y + 8z = -18
3x + 2y - 4z = 9
2x - 5y + 2z = 5

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.