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

You might be interested in

Hi! Please help, I'd appreciate it!

Romashka-Z-Leto [24]

The volume of sphere is $\frac{1372}{3}\pi$ feet cubed.

Step-by-step explanation:

Given,

Surface area of sphere = 196π square feet

Surface area of sphere = 4πr²

We will find radius of sphere.

$4\pi r^2=196\pi$

Dividing both sides by 4π

$\frac{4\pi r^2}{4\pi}=\frac{196\pi}{4\pi}\\\\r^2=49$

Taking square root on both sides

$\sqrt{r^2}=\sqrt{49}\\r=7$

The radius is 7 feet.

Volume of sphere = $\frac{4}{3}\pi r^3$

$Volume=\frac{4}{3}\pi (7)^3\\\\Volume= \frac{4}{3}\pi *343\\\\Volume = \frac{1372}{3}\pi$

The volume of sphere is $\frac{1372}{3}\pi$ feet cubed.

Keywords: volume, surface area

Learn more about surface area at:

#LearnwithBrainly

3 0

3 years ago

Fiona divided 3x2+5x-3 by 3x+2. The expression represents the remainder over the divisor.

Lera25 [3.4K]

Answer:

-5

Step-by-step explanation:

Shown in the attachment.

The remainder when 3x^2 +5x -3 is divided by 3x+2 is -5

4 0

4 years ago

Cos6x + cos2x + 2cos4x

Troyanec [42]

Step-by-step explanation:

everything can be found in the picture

6 0

3 years ago

Write a rule for the function

cestrela7 [59]

Answer:-18

Step-by-step explanation: i know evertyhing

3 0

3 years ago

Write 1 2/3 as the sum of a whole number and two fractions that have the same denominator.

larisa [96]

1+1/3+1/3 because 1/3 and 1/3 have the same denominator.

7 0

3 years ago