Acompany that sells cellular phones has a cost of 4x + 10 dollars and a revenue of x2+5x+6 dollars, where x represents the number of cell phones sold per week. if profit = revenue - cost, find the company's profit.

a) x^2+x−4

b) x^2+2x−4

c) x^2−x+4

d.) x^2−2x+4

On a piece of paper graph f(x)=5•(0.4)^x

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items