Answer:
f(m+n+p) = 9^(m+n+p)
while f(m) × f(n) × f(p) = 9^m+9^n+9^p = 9^(m+n+p)
so the second property explains why it's a + instead of ×
The largest angle in a triangle is three times as big as the smallest angle, and the middle angle is twice as big as the smalles
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The answer is 5 13/15 or atleast according to calculator.net (the website used in the picture) :)
