At time x=0 , water begins to drip steadily out of a water tank. After 3 hours, there are 7.7gallons of water in the tank. After 9 hours, 7.1 gallons remain. Write a linear function rule that models the number of gallons of water y left in the tank for any number of hours x.

The linear function rule is y=

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

What is the value of x in the diagram below?

Through: (-3,-3) parallel to y= 7/3x+3