The time, t, in hours, it takes to get to a certain destination varies indirectly as the speed of the car, s. If it takes 3.25 hours at a speed of 72 mph to reach a destination, how many hours will it take to reach the same destination at a speed of 36 mph?
A. 14.625
B. 6.5
C. 13
D. 1.625

B. 6.5

Step-by-step explanation:

If we're going somewhere at half the speed, it will take double the time. 36/72 = 1/2, and 6.5/3.25 = 2.

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.