Hello!
P(x)=2x²+55x+10-(2x²-15x-40)=70x+50
P(240)=70*240+50=16850.
As as we can clearly see, given that the equation of the revenue is R=2x2+55x+10 and the equation of the cost is C=2x2 – 15x – 40, you will get the profit by subtracting the revenue from the cost: R-C=P. Therefore, P=(2x2+55x+10)-(2x2 – 15x – 40). You will get P=70x+50 where x is is the number of cellphones sold. If 240 cellphones are sold, then the profit is 16850 dollars.
Hope this Helps AT LEAST! Have A Wonderful Day! :)