If f(1) = 1 and f(n) = f(n-1)2 – 4 then find the value of f(4).

How come you don't know this question?

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

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if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: