Answer:
Step-by-step explanation:
Additive indentity

n = 1
a variable is always a number itself remember 7+n
5+2 = 7
Answer:
standard deviation is a quantity calculated to indicate the extent of deviation for a group as a whole.
Residual analysis is used to assess the appropriateness of a linear regression model by defining residuals and examining the residual plot graphs.
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112.5 I believe is the right answer
Answer:
the answer to the questions is 140