Question

Can someone help me understand this?

Answer 1

When x = 9,
[m(n(x))= mn(x)]
Then,
mn(9)
$= m( \frac{ \sqrt{9} }{3} )$
$= m( 1)$
$= 2 \times 1 - 2$
$= 0$

the correct answer is F.

Answer 2

M(9) = 2x - 2
Divide each term by 9 and simplify

Exact form
M=16/9

Decimal form
M=1.777

N(9)=¥9/3
Divide each term by 9 and simplify

Exact form
N=1/9

Decimal form
N=0.111