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user100 [1]
2 years ago
12

Which expression is equivalent to 9^-2? O-81 O-18 O1/81 O1/18

Mathematics
1 answer:
kherson [118]2 years ago
5 0

Answer:

Option C - 1/81

Step-by-step explanation:

9^(-2) = 1/(9^2) [ Because a^(-m) = 1/(a^m) ]

so, 1/(9²) = 1/81.

Hope this helps you.

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Please help me answer this
irga5000 [103]
I think it is -0.125.
It might also be 0.125
4 0
3 years ago
Read 2 more answers
A copying machine reduces a 12 cm line to 10.5 cm
Dmitrij [34]

Answer:

14cm

Step-by-step explanation:

10.5 is 87.5% of 12, and 87.5% x 16 = 14

you can find the percentage by using 10.5/12 and x/100 to find x

10.5 * 100 = 1050

1050/12=87.5

7 0
3 years ago
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Find the value of z such that 0.96420.9642 of the area lies between −z−z and z. round your answer to two decimal places.
Brut [27]
If z represents the variable of the standard normal distribution curve N(0,1), which is symmetrical about z=0, then we look for
P(z)-P(-z)=0.9642=1-2P(-z) => P(-z)=(1-0.9642)/2=0.0179
=>
-z=-2.099192
=> z=2.099192
Check:
P(2.099192)-P(-2.099192)=0.9642  ok
7 0
3 years ago
Louise gave her pet hamster 8.3 ounces of water one week and another 7.75 ounces the next week.
stiv31 [10]
Simply add

8.3 ounces + 7.75 ounces = 16.05 ounces was the total amount of water.
4 0
3 years ago
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Which ordered pair is the solution to the system of equations? {−3x+4y=−20y=x−4 (−4, −8) (4, 8) (−2, −6) (0, −5)
DanielleElmas [232]

Answer:

Step-by-step explanation:

-3x + 4y = -20

y = x - 4

Put the second equation into the first equation in place of y.

-3x + 4 (x - 4) = -20

Multiply everything in the parenthesis by 4.

-3x + 4x - 16 = -20

Combine like terms.

x - 16 = -20

Add 16 to both sides.

x = -4

Put this into the second equation in place of x.

y = -4 - 4

y = -8

Your solution set is (-4,-8).

Hope this helps!

7 0
3 years ago
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