Free points a giveaway

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

Solve this problem! extra ! 3025/5.5 = a/90.75

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.