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S_A_V [24]
2 years ago
13

Simplify. (-2)^-3 PLEASE HELP

Mathematics
2 answers:
nika2105 [10]2 years ago
4 0
You have a negative exponent so you have to bring the -2 down : 1/-2^3. Then you multiply the -2*-2*-2 which is -8 so you get 1/-8 or -1/8. It means the same thing.
Ber [7]2 years ago
3 0
-1 / 8

STEPS:

Base problem: <span>(-2)^-3
</span>1. 1 / <span><span><span>(<span>−2</span>)</span>*<span>(<span>−2</span>)</span></span>*<span>(<span>−2</span><span>)
</span></span></span>2. 1 / (<span><span><span>−2</span>)^</span><span>3
3. -1 / 8</span></span>
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Answer:

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Step-by-step explanation:

This is a conditional probability exercise.

Let's name the events :

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NT : ''The test is negative''

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In the exercise :

P(I)=0.025

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We are looking for P(I/PT) :

P(I/PT)=P(I∩ PT)/ P(PT)

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0.904=P(PT∩ I)/0.025

P(PT∩ I)=0.904 x 0.025

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0.041=P(PT∩ NI)/0.975

P(PT∩ NI) = 0.041 x 0.975

P(PT∩ NI) = 0.039975

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P(PT)= 0.0226 + 0.039975

P(PT) = 0.062575

P(I/PT) = P(PT∩I)/P(PT)

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Step-by-step explanation:

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