At 2: 15 pm, the temperature of a substance in a science experiment was 7∘f. the temperature was then recorded at 15-minute intervals. at each interval, the new temperature was 3∘f less than the previous temperaturewhat was the temperature of the substance at 3: 30 pm?

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?