PLEASE HELP Pipe cost $3per foot. The equation y= 3x relates the cost of a piece of pipe (y) to the number of feet (x). Identify the unit rate in the equation

Answer choices:

a) x

b) 3

c) y

d) 3x

Which of the following situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

How to do this , and can some one explain