The world's fastest fish, a sailfish swim at a rate of 69 miles per hour. is the distance a sailfish swim proportional to the number of hour it swims?
[is there an answer with numbers? ]

yes it is.

Step-by-step explanation:

The distance x that it swims is directly proportional to the time t that it swims at a constant speed v:

X=vt

V= 69miles/hour

X=69t, with t in hours, x in miles

Hope it helps.

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.