3 years ago

Given the function f(x) = 3x, find the value of f−1(81).

Mathematics

1 answer:

Vadim26 [7]3 years ago

8 0

$f^{-1}(81)$ is asking for what number x will the function $f(x)=3x$ will produce 81.

3x = 81
x = 27

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Please answer this question. Your explanation does not need to have that much effort put into it. This is a 10 point question.

Elis [28]

Answer:

B and C

Step-by-step explanation:

3 2/5 times 7 = 23 4/5

3 2/5 times 10 = 34

The rest of the answers are incorrect

7 0

2 years ago

Read 2 more answers

Which equation is the direct variation equation if f(x) varies directly with x and f(x)=-18 when x=3

Otrada [13]

$\bf \qquad \qquad \textit{direct proportional variation}\\\\
\textit{\underline{y} varies directly with \underline{x}}\qquad \qquad \stackrel{f(x)}{y}=kx\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\textit{we also know that }
\begin{cases}
y=-18\\
x=3
\end{cases}\implies -18=k3
\\\\\\
\cfrac{-18}{3}=k\implies -6=k\qquad therefore\qquad \boxed{\stackrel{f(x)}{y}=-6x}$