Been stuck on this for a few days now, help on even one would be greatly appreciated!!!

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48