The revenue from selling x shirts is r(x) = 11x. the cost of buying x shirts is c(x) = 6x + 20. the profit from selling x shirts is p(x) = r(x) – c(x). what is p(x)? multiple choice: a. p(x) = 17x + 20 b. p(x) = 17x – 20 c. p(x) = 5x + 20 d. p(x) = 5x – 20

D. p(x) = 5x – 20

there will be 35 boys in each team. : )

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places