Check the functions whose inverses are also functions

1. What is the solution to the system? [1] x + 2y+3z=6 [2] y+2z=0 [3] z=2 a. (10, 0, 2) b. (8, - 4, 2) c. (6, 0, 2) d. (-8, 4, 2)

How many sides does a regular heptagon have

Irene paid $40 more of her cell phone bill in July then in June and August she paid $10 less than her June bill if she paid a total of 120 for her cell phone bill for all three months how much did she pay for her August Bill

One of the parallel sides of a trapezium is 5cm longer than the other. If the prependicular distance between them is 9cm and area is 126cm 2 , find the length of the parallel sides.

A hose is filling a water tank at the rate of 70 gallons per minute. A loose drain plug causes 4 gallons per minute to drain out. How many minutes does it take to fill a tank with a capacity of 3960 gallons?

A spring is oscillating so that its length is a sinusoidal function of time. Its length varies from a minimum of 10 cm to a maximum of 14 cm. At t=0 seconds, the length of the spring was 12 cm, and it was decreasing in length.

Barry Olson just purchased 800 shares of an electronics corporation stock at $42.17 per share. His online broker charged him $10.00 commission. What was the total cost of the stock? Show work. A) 22,489 B) 33, 579 C) 42, 458 D) 33, 746

What fraction of an hour is 54 minutes

Everado paid $1.12 for a dozen eggs at his local grocery store. Determine the cost of 3 eggs.

The height of a cylinder is twice the radius of its base What expression represents the volume of the cylinder, in cubic units? O 4nx2 O 2nx3 O nx2+2x O 2+nx3