Luisa earns money mowing her neighbors' lawns.

the revenue for mowing x lawns is r(x) = 20x.
luisa's cost for gas and the mower rental is c(x) = 4x + 25.

her profit from mowing x lawns is p(x) = (r – c)(x). what is p(x)?

a. p(x) = 24x – 25

b. p(x) = 16x + 25

c. p(x) = 16x – 25

d. p(x) = 24x + 25

C is the correct option.

Step-by-step explanation:

We have been given that

The profit is the difference of revenue and cost function.

Mathematically, we can write profit function as

We know that . Thus, we have

Plugging, the r(x) and c(x) functions

Distribute negative over the parenthesis

Combine the like terms. 20x-4x = 16x

C is the correct option.

C. p(x) =  16x - 25

Step-by-step explanation:

1. First define the equation that describes the profit Luisa earns, that is the revenue for mowing minus the Luisa´s cost for gas and the mower rental. So the equation is:

p(x) = (r – c)(x) (Eq.1)

2. Write the equations for the revenue for mowing and the cost for gas and the mower rental:

- Equation for the revenue for mowing:

r(x) = 20x (Eq.2)

- Equation for the cost for gas and the mower rental:

c(x) = 4x + 25 (Eq.3)

3. Replace the equations Eq. 2 and Eq. 3 in Eq. 1:

p(x) = (r – c)(x)

p(x) = 20x - (4x + 25)

p(x) = 20x - 4x - 25

p(x) = 16x - 25

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step-by-step explanation: