Solving for y means to get that variable on one side of the equation and everything else needs to be on the opposite side of y.
We also know x is equal to 28. So, we can replace x with 28.
Now the equation will look something like 28 + 3y = 28
Now let us solve it.
28 + 3y = 28
First, subtract 28 from each side of the equation.
(28 + 3y) - 28 = 28 - 28 =
3y = 0
Now divide each side by 3.
3y / 3 = 0 / 3
y = 0/3
If a fraction has a numerator of 0, that means it's 0.
So, y is equal to 0.
Answer:
She should offer a guarantee of 13.76 years.
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 zscore 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 pvalue, we get the probability that the value of the measure is greater than X.
The average life of a certain type of small motor is 10 years with a standard deviation of 2 years.
This means that 
If she is willing to replace 3% of the motors that fail, how long a guarantee (in years) should she offer?
She should offer the 100 - 3 = 97th percentile as a guarantee, so X when Z has a pvalue of 0.97, that is, X when Z = 1.88.




She should offer a guarantee of 13.76 years.
Your (third) selection is correct. Just only refer the value of x to get the value of y dependently.