For the first one your equation is h(d)=3/7d+5 If d represents the number of days and the question is wanting to know the height after 1 week (7 days) then you would get this equation once 7 is in the place of d h(d)=3/7(7)+5 When solved you answer is 8 inch.
For the second one your equation is f(x)=75x+250 If x represents the number of weeks and the question is asking how much money Sam will have after 12 weeks then you will get this equation once putting in 12 f(x)=75(12)+250 Once solved you will get the answer $1150
