Finding an output of a function from its graph

f(-2) = 0.

Step-by-step explanation:

WE see that the graph cuts the x-axis  when x = -2 and the values of f(x) at this point is 0.

Step-by-step explanation:

Draw a real or imaginary vertical line through the input (x-) value.  The corresponding output (y-) value can be read from the graph.  

For example:   If x = -2, we see that the vertical line x = -2 intersects the graph at y = 0, which is the output of this function when the input is =2.

x is greater than 5

step-by-step explanation:

2x+7 is greater than 17

    -7                           -7

2x is greater than 10

divide by 2 each side

x is greater than 5

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).