What would be the rate of change and the initial value

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

The function c(n) below relates the number of bushels of apples picked at a pick-your-own orchard to the final cost for the apples. it takes as input the number of bushels of apples picked after paying an entry fee to an orchard and returns as output and returns as output the cost of the apples (in dollars)c(n) = 15n + 30which equation below represents the inverse function n(c), which takes the cost of the apples as input and returns the number of bushels picked as output

Write ratios for the amount of oats to the amount of each of the other grains?