A function is defined by f(x) = 12 - 3x. If a is a positive integer, for how many values of a can f(a) be positive?
A. 0
B. 1
C. 2
D. 3
E. 4

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2