4000 (4x10^3) times 400 (4x10^2) is equal to 16x10^5 ( 1,600,000)
Answer:
I think it’s the first one, A
Let

denote the number of minutes spent brushing his teeth, and let

be the mean and

the standard deviation for this distribution.

The z-score corresponding to this probability is approximately

, which means

Next, (note the sign change)

The corresponding z-score is approximately

, so you have

Solving the two equations for

and

, you'll find that the mean is approximately

and the standard deviation is approximately

.
30+5y_>4x
5y_>4x-30
The answer is: y_>(4/5)x-6
Answer: 2nd place
Step-by-step explanation: you were in 3rd place and you passed the person in 2nd now making your placement 2nd and the other persons 3rd