Answer:
The data item is 
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean
and standard deviation
, the z-score of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
Mean of 400 and a standard deviation of 60.
This means that 
z=3
We have to find X when Z = 3. So




The data item is 
Using the distributive property it would be -24u12y18
Answer:
The second choice
Step-by-step explanation:
In most cases, the dependent variable is the y value in the graph.
The dependent variable is the thing that is being measured or changing.
In this example it can't be the time because time is always moving at a constant rate and there is nothing that can be done to change it.
7x-(x-y) = 7x - x + y = 6x + y
9a-(2b-a) = 9a+a-2b = 10a-2b
hope it helped
Answer:
i have no idea
Step-by-step explanation: