The monthly water bill is a function of the number of gallons used. The cost is $19.60 for 20,000 gal or less. Over 20,000 gal, the cost is $19.60 plus $1 for each 1000 gal over 20,000 with any fraction of 1000 gal charged at a fraction of $1. On what interval is the cost constant? On what interval is the cost increasing? On what interval is the cost constant? Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
A. The cost is constant on the interval(s)
(Type your answer in interval notation. Use a comma to separate answers as needed.)
B. The cost is never constant.

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)

Astudent solves the equation for v. start with the original equation. use the square root property. use the division property of equality. use the multiplication property of equality. simplify. which statement explains how to correct the error that was made? the square root property must be applied after all other properties of equality are applied. the multiplication property of equality should have been applied before the division property of equality. the division property of equality should have been applied to move the fraction to the other side of the equation. the square root property should have been applied to both complete sides of the equation instead of to select variables.