Can someone tell me the answer please

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

Find the equation using the point (4,8)

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?