A short mathwork!

This work isnt too much or too long, but  would really appreciate it when doing it if you do it in a way that shows how you think in other words dont just write down the answer! 

Tests

WHAT IS A FUNCTION?

1. f (x) = 3x + 2

a) Calculate f (2)

b) Calculate f (-1)

c) Solve the equation f (x) = 4

2. f (x) = 2x – 1

a) Calculate f (0)

b) Solve the equation f (x) = 0

3. V (x) = 200x – 8000, where V (x) is the profit of sec/money/dollar for x tickets sold.

a) Calculate the V (200)

b) Solve the equation V (x) = 200

c) Explain in words the difference between V (200) and V (x) = 200

d) Enter the dependent and independent variable.

4. The cost of renting a bike is 50 bucks in base-pay plus 10 bucks per hour.

a) Make a table that shows the cost of 2, 4 and 6 hours.

b) Specify a function that describes the cost/dollar y as a function of time x hours.

c) Draw with the help of the table a graph of the function.

d) Describe the graph in words.

e) Which variable is the dependent and which is independent?