Answer:
He would need to run 7 more times to meet his goal of 5 miles
Pikachu is right.
Undetermined Coefficients (that we learn here) only work when f(x) is a polynomial, exponential, sine, cosine, or a linear combination of those.
And,
As we can see that the equation given is a Polynomial,
So, Pikachu is right.
Learn more about Polynomial:
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Answer and Step-by-step explanation:
The sides we have are 7,
, and
.
The square root of 80 is less than 9 but greater than 8 (because
is 64,
is 81, and 80 is in between those two values), and the square root of 31 is definitely less than the square root of 80.
So,
is the longest side.
1) The square of
is: 
2) The sum of the squares of the two shorter sides is:

3) Since the square of the longest side is equal to the sum of the squares of the two shorter sides, by the Pythagorean Theorem, the triangle is a right triangles.
Hope this helps!