21. On Friday, the temperature at 8:00a. m. was 49°F and rose at a constant rate of OF per hour until noon. A
cold front passed through at noon, and the temperature
then fell at a constant rate of 1°F per hour. The
temperature first fell below 49°F between:
A. noon and 1 p. m.
B. I p. m. and 2 p. m.
C 2 p. m. and 3 p. m.
D. 3 p. m. and 4 p. m.
E. 4 p. m. and 5 p. m.
22. Letter grades in Hugo's math class are based on the
norcent of the total possible points on 4 unit exams