The mean will be calculates as follows; from the formula of z-score we shall have:
z=(x-μ)/σ
the z-score associated with 0.5% is 0
thus
0=
(8-μ)/0.4=0
solving for x we get:
μ=9
Answer: μ=9
The quotient rule for exponents states that if we divide exponents with the same base, then we can subtract the exponents and keep the base unchanged.
Answer:
75% left is not taken up so do the Ab to the other
Step-by-step explanation:
0.75 sorry if Im wrong

and

(f+g)(x) =

combining like terms gives you answer choice B
Divide 18 by 2(9) then square that (81). add 81 to both sides