What is the sum of (-2.1x + 3.7) and (5 + 4.9x)? A. -7.0x + 8.7

B. -2.8x + 8.7

C. 2.8x + 8.7

D. 7.0x + 8.7

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal