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melomori [17]
3 years ago
8

Evaluate the log without a calculator ( Show your work )

mula1" title="log_{81} 27" alt="log_{81} 27" align="absmiddle" class="latex-formula">
Mathematics
2 answers:
mamaluj [8]3 years ago
5 0

Answer:

3/4 ( or 0.75).

Step-by-step explanation:

let y = log81 27, then:

27 = 81^y     ( by the definition of a logarithm).

27 = 3^3 and 81 = 3^4

So 27 =  81 ^3/4

so y = log81 27 = = 3/4.

OLEGan [10]3 years ago
4 0

Answer:

\log_{81}(27)=\frac{3}{4}

Step-by-step explanation:

The given logarithm is

\log_{81}(27)

Let us change to base 3.

\log_{81}(27)=\frac{\log_3(27)}{\log_3(81)}

\log_{81}(27)=\frac{\log_3(3^3)}{\log_3(3^4)}

\log_{81}(27)=\frac{3\log_3(3)}{4\log_3(3)}

\log_{81}(27)=\frac{3(1)}{4(1)}

\log_{81}(27)=\frac{3}{4}

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(-5z)^3 using only positove exponents
Elena L [17]

Answer:

Shown below

Step-by-step explanation:

First allocate the power of three to every number

-5^{3}  * z^{3} = -125 * z^{3}

not sure what you mean by positive exponents, the exponents already are positive. Maybe you mean positive exponents and integers?

8 0
2 years ago
Maria, a biologist, is observing the growth pattern of a virus. She starts with 100 of the virus that grows at a rate of 10% per
Leni [432]
<h3>Answer: 985</h3>

=============================================

Work Shown:

A = amount after t hours

P = initial amount = 100

r = growth rate in decimal form = 0.10

t = number of hours = 24

--------

A = P*(1+r)^t

A = 100(1+0.10)^24

A = 100*(1.10)^24

A = 100*9.84973267580762

A = 984.973267580762

A = 985

5 0
3 years ago
Read 2 more answers
WHO EVER GOES FIRST GETS BRAILY
Ira Lisetskai [31]

Answer:

C.) i belive this is the correct one

Step-by-step explanation:

7 0
3 years ago
Solve the following question algebraically. SOMEONE PLEASE HELP ME! ILL MARK THE BRAINLIEST ANSWER!!I’VE TRIED TO FIGURE IT OUT
Delicious77 [7]

Solve for x. Isolate the x. Note the equal sign. What you do to one side, you do to the other. Do the opposite of PEMDAS.

First, multiply 3 to both sides

6(3) = ((x + 2)/3)(3)

18 = x + 2

Finally, isolate the x. Subtract 2 from both sides

18 (-2) = x + 2 (-2)

x = 18 - 2

x = 16

16 is your answer for x

hope this helps

8 0
3 years ago
What happens to the value of the expression 80-2r as r decreases?
Ghella [55]

Answer:The value of the expression increases as r decreases.

Step-by-step explanation:

To find : What happens to the value of the expression as r decreases?

Given Expression: 80-2r

We check for different value of r as decreasing order,

r        80-2r

5        80-10=70

4        80-8=72

3        80-6=74

2        80-4=76

1         80-2=78

As r decreases the value of expression increases.

Therefore, the value of the expression increases as r decreases.

Hope this helps!

8 0
3 years ago
Read 2 more answers
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