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3 years ago

Please help! Find value of x.

Mathematics

1 answer:

aniked [119]3 years ago

4 0

Maybe its 18 :| but idk

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What is the value of xx) = 9^x when x= -2? A. 1/81 B. 81 C. 1/81 D. 18

Paraphin [41]

Answer:

C. $9^{-2} = \frac{1}{81}$

Step-by-step explanation:

Given

$9^{x}$

Required

Find the expression where x - 2

$9^{x}$

Substitute 2 for x

$9^{-2}$

From law of indices which states

$a^{-b} = \frac{1}{a^b}$

So, the expression becomes

$9^{-2} = \frac{1}{9^2}$

Expand the denominator

$9^{-2} = \frac{1}{9 * 9}$

$9^{-2} = \frac{1}{81}$

Hence, $9^{x}$ is $\frac{1}{81}$ when x = 2

5 0

3 years ago

Please help ill give brainliest to the right answerrrr

Oliga [24]

Answer:

the 3rd and pls give me brainliest

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Find the midpoint of PQ.

andrew11 [14]

Answer: D. (3, -1)

Step-by-step explanation: its the only point that is in the line

4 0

3 years ago

Read 2 more answers

Write 1 over 9 as a decimal and round it to 2 decimal places

FromTheMoon [43]

Answer:

0.111

Step-by-step explanation:

1/9 as a decimal is 0.11111111 but rounded to 2 decimal places is 0.111.

Hope this helps :)

Have a good day / night

3 0

2 years ago

Read 2 more answers

The maximum load that a cylindrical column with a circular cross section can hold varies directly as the fourth power of the dia

kifflom [539]

Answer:

2396

Step-by-step explanation:

Let the diameter = d

Let the height = h

Formula

Metric Tons = k * d^4 / h^2

Solution

Metric Tons = 64

d = 2

h = 9

k = ?

(You can't do the second part by not using a ratio unless you put k in and solve for it)

64 = 2^4 k / 9^2

64 = 8 *k / 81

64 * 81 / 8 = k

5184 / 8 = k

k = 648

Solve for the second example

Metric Tons = d^4 * k / h^2

Metric Tons = ?

d = 5

h = 13

k = 648

Metric Tons = 5^4 * 648 / 13^2

Metric Tons = 625 * 648 / 169

Metric Tons = 2396 rounded.

7 0

3 years ago