Question

HELP PLEASE!:) I GIVE MEDALS :)

What value of N solves the equation?

3^N = 1/81

A.
–243


B.
–27


C.
–4


D.
4

Answer 1

plug in each value, use a calculator.

Answer 2

plug in -4... what do you get @macabbey101 ?

Answer 3

its not working for me :/ its just giving me a bunch of numbers..

Answer 4

is it D?

Answer 5

\[3\ ^{-4}=?\]

Answer 6

\[3^{-4}=\frac{ 1 }{ 81 }\]

Answer 7

so what is you're answer?

Answer 8

c.

Answer 9

Review your exponent laws. You have to understand what a negative exponent means.
Also you have to recognize (or use trial and error) to see that 81 is 3 to the exponent 4.

Answer 10

\[3^n = \frac{ 1 }{ 81 } = \frac{ 1 }{ 3^{4} } = 3^{-4} \]

Answer 11

So n = -4 which is answer c.