A and b are positive integers and a-b=2 ... Evaluate the following: a) 2^a/2^b
b) 5^a/5^b
c) 4^0.5a/2^b

Step-by-step explanation:

a) 2^{a-b}

b) 5^{a-b}

c) \frac{0.5a}{2^b}

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.