That's correct but whats your question?
Step-by-step explanation:
________________________________
Step 1:

Wright the equation
________________________________
Step 2:

Transfer the power of y ie ¹² up to subtract it
________________________________
Step 3:

by subtracting the powers we get 0
________________________________
Step 4:

so the results comes 1 because anything ⁰=1
________________________________
⚡Final answer :1✓
________________________________
hope it helped you:)
Answer:In statistics, a forecast error is the difference between the actual or real and the predicted or forecast value of a time series
Step-by-step explanation:find the Mean Absolute Percent Error (MAPE) of your forecast. Statistically MAPE is defined as the average of percentage errors.