Answer:
x>
−2
3
Step-by-step explanation:
Let P = number of problems solved per day.
P = 448/28
P = 16
Lisa solved 16 problems per day.
Answer:
x = 4
Step-by-step explanation:
DO + OB = DB
15 + 3x + 7 = 9x - 2
3x + 22 = 9x - 2
3x + 24 = 9x
24 = 6x
4 = x
8 + 2(10 - r) = 8 + 20 - 2r = 28 - 2r