Very easy:
put the 10 and 12 end to end then back off the 7 inches
22-7 = 15
Use the next formula to find the margin or error:

z is the critical value (For a 95% confidence level the z-score is 1.95998)
σ is the standard deviation
n is the sample size

<h2>Then the margin of error is: 6.6639</h2>
The answer is y=(x-5)^2+3