A family goes hiking in Death Valley which has the lowest elevation in North America. They start out 200
feet above sea level before descending into the valley.
They descend into the valley at a rate of 100 ft. every 30
minutes. After hiking for 3 hours, at what elevation are
they?

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.

b mark me branliest thx

step-by-step explanation:

i believe it's a.

i'm not sure on this one, most likely correct.