Please help i dont wanna fail

The total cost of the 3 shirts including shipping is $71.83. They want to know how much each shirt costs without shipping so you are going to do $71.83 subtract $7.99. This gives you $63.84 for the 3 shirts without shipping. Now you are going to take $63.84 and divide by 3. This comes out to be $21.28 For each shirt.
I was just solving that equation out for you just in case. What you need to put in the box is this:

3s + 7.99 = 71.83

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0

answer: the function g(x) has the greatest slope.