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

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.