It would be A because 3 times 10^4= 30000. 6 times 10^3= 6,000.
You ended without giving the values, so we can't get the exact answer. However, I can tell you steps.
First, you need to find the z-score. Then, look up the z-score on a normal distribution table and you will get the percent.
Let's call your value X. Just plug X into the equation below and you will have your z-score.
(x - 20.5) / 3.5 = z
Now, look up the z-score and you will have your probability.<span />
Step-by-step explanation:

18x³y⁴
the answer is 0, or 0/0 because anything times 0 will always be 0 and 0 does not have a half :)))))
Answer: x= -42, y=8 >>> (-42,8)