Melissa exercises for 20 minutes every day. she decides to increase her daily exercise time by 5 minutes each week. however, according to her doctor’s orders, she can spend no more than 45 minutes a day exercising. for how many weeks can melissa increase her exercise time this way?
a at least 13 weeks
b at most 5 weeks
c at most 13 weeks
d at least 5 weeks

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212