Kevin sells personalized party hats. Each party hat is a cone with a slant length of 9 inches and a radius of 3 inches. How tall is the inside of the party hat? Round your answer to the nearest tenth. *

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?