How do you evaluate $f (7)$ $f(7)$ given $f (a) = 3 a$ $f(a)=3a$ ?

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Answer 1 · 2018-05-13T10:22:28

21

Just substitute 7 in the place of a and you have got your cake..
$f (a) = 3 \cdot a$ $f (a)=3*a$
So, $f (7) = 3 \cdot 7 = 21$ $f(7)=3*7=21$

How do you evaluate f(7)f(7) given f(a)=3af(a)=3a?