Acompany that manufactures cell phones has done research to determine how the pricing of thier phones affects how many they sell and how much money they make. they have determined that if p is the price of a phone in dollars, the following equations model thier cost, c, and revenue, r. c=500+200p and r= -p^2+800. what range can they price the cell phones so there will be a profit

a. less than $130 or more than $770

b. less than $200 or more than $500

c. between $130 and $770

d. between $200 and $500

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d

idk wbu

step-by-step explanation:

the answer is  

a.

4,624π mm2

step-by-step explanation: