Profit is the difference between revenue and cost. the revenue, in dollars, of a company that manufactures cell phones can be modeled by the polynomial 2x2 + 55x + 10. the cost, in dollars, of producing the cell phones can be modeled by 2x2 – 15x – 40. the variable x represents the number of cell phones sold.
what expression represents the profit, and what is the profit if 240 cell phones are sold?
a)40x – 30; $2,400
b)40x – 30; $9,570
c)70x + 50; $16, 850
d)70x + 50; $28,800

Can someone me with my hwplz(only the circled ones)

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

Write a similarity statement for the similar triangles. afgh ~ a