Question 459816
if 4 -3a=7-2(2a+5) evaluate a^2+7a

4-3a=7-4a-10
-3a+4a=7-10-4
a=-7

a^2+7a= 49-49
=0
.....
(-2x^3+x-1)-(-x^2+x-3)
-2x^3+x-1 +x^2-x+3
-2x^3+x^2+3


(2x^2+5x-3)-(3x^3+2x-5)
-3x^3+2x^2+3x+5


a ship traveling east at 25mph is 10mi from a harbor when another ship leaves the harbor traveling east at 35mph. How long does it take the second ship to catch up.?


catch up distance = 10 miles
catchup speed = 35 -25 = 10 mph
catchup time = catchup distance / catch up speed
10/10
=1 hour to catch up