i need help with three questions asap!!

1. which situation could be modeled as a linear equation?

a) the value of a car decreases by 10% every year

b) the number of a fish in a lake doubles every 5 years

c) two liters of water evaporate from a pool every day

d) the amount of caffeine in a person’s body decreases by 1/3 every 2 hours.


2. -2/3(x+12)+2/3x=-5/4x+2

3. When 3a + 7b > 2a - 8a is solved for a, the result is…

1) a > -b

2) a < -b

3) a < -15b

4) a > -15b