With this one, plug in the values with the corresponding letters. 1/3m would be the same as 1/3(21) to get an answer of 7. Then 1/2(12) which is 6. Now the equation is 7-1-6 to get an answer of 0.
Is there something else to this question?
For example the numbers 45 and 20
There should be a dialogue question. Let's assume we gathered files and they were distributed with a mean of 45 minutes and a standard deviation of 12 minutes.
Now let's assume some random person had to wait less than 20minutes
Now to calculate the z-score we will use

This gives us a z-score of 2.08
Answer:
y = 3x + 5
Step-by-step explanation:
The zero seems to be a place holder to mess you up. Just ignore that it doesn't do anything. Add -3x and -5 to the both sides to create y = 3x + 5
Answer:
y = -57
Step-by-step explanation:
If you follow the pattern the y value is the x value multiplied by 4
5 x 4=20
Y=20