After 30 seconds in the water the temperature of the thermometer had decreased by 7.5^circ C Calculate the average decrease in temperature each second.

## Step 1: In this problem, we are asked to find the average decrease in temperature each second. This is a rate problem, which means we need to divide the total change in temperature by the total time.## Step 2: The total change in temperature is given as , and the total time is given as 30 seconds.## Step 3: To find the average decrease in temperature each second, we divide the total change in temperature by the total time. ###