A typist can type 4800 words per hour. How many words can she type in 1 minute? (Using direct proportion)​

4800/60

= she can type 80 words per minute

80

1 hour= 60mins

So to know how many words can she type in 1 min, we do the math "4800 : 60"

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.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x