2. Sara started out with $50 in her piggy bank. Every week she deposited the same amount of money in the bank. After 7 weeks she had $67.50. Find the average rate of change or slope
in dollars per week. (This is a unit rate.)
3. At 4 a. m. the temperature was 38 degrees F. By 11 a. m. the temperature had risen to 60
degrees F. Find the average rate of change or slope in degrees per hour.