Answer:
She drove 60 miles in 3 hrs. This means she drove (60/3 = 20)....20 miles per hr.
I paid $15 for 3 hamburgers. This means 15/3 = 5....it costs $5 per burger.
Step-by-step explanation:
Are you asking about the sigma sign used for sequence additions?
Answer:
(f - g)(x) = (3x + 1) - (x^2 - 6) = 3x + 1 - x^2 + 6 = -x^2 + 3x + 7

notice then, is clearly, -10, -12, -14, -16, -18 and so on.