If the revenue of a cookie company is f(x) = 2.5x + 16, where x is the number of cookies sold, and the expenses of the company are g(x) = x + 20, where x is also the number of cookies sold, what is the profit of the company if they sell 126 cookies?

I'm terrible at math any here is appreciated.

Tomas is making trail mix using granola and walnuts. he can spend a total of $12 on the ingredients. he buys 3 pounds of granola that costs $2.00 per pound. the walnuts cost $6 per pound. he uses the equation to represent the total cost, where x represents the number of pounds of granola and y represents the number of pounds of walnuts. he solves the equation for y, the number of pounds of walnuts he can buy. answer- b tomas added 6 to both sides of the equation instead of subtracting 6. just took the test

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17