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timurjin [86]
3 years ago
7

Which expression is equivalent to -8? A=-2^-3 B=(-1/2)^-3 C=(1/2)^-3 D=2^-3

Mathematics
2 answers:
Goshia [24]3 years ago
7 0

Answer:

<h2><em><u>B. (-1/2)^-3</u></em></h2>

Step-by-step explanation:

B is the answer. This is because you have to calculate (-1/2)^-3 on a calculator. When I did that calculation, I got -8.

(-1/2)^-3      =    (-2)^3 = -2*-2*-2 = 4 * -2 =<em><u> -8</u></em>

Hope this helped,

Kavitha

sladkih [1.3K]3 years ago
4 0

Answer:

The answer is option B.

Step-by-step explanation:

( -  \frac{1}{2} ) ^{ - 3}  = ( - 2) ^{3}  =  - 8

Hope this helps you

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Drinking 8 fluid ounces of milk provides 270.0 milligrams of calcium. How many fluid ounces of milk provide 72.5 milligrams of c
Margarita [4]
Set up a proportion:

\frac{8}{270} = \frac{x}{72.5}

The numerator represents fluid ounces of milk, and the denominator represents milligrams of calcium.

Simplify the first fraction to make multiplication easier:

\frac{8}{270} \div  \frac{2}{2} =  \frac{4}{135}
\frac{4}{135} = \frac{x}{72.5}

Cross multiply the fractions:

72.5 * 4 = 290
135x = 290

Divide both sides by 135 to get x by itself:

290 \div 135 = 2.1
x = 2.1


2.1 fluid ounces of milk provide 72.5 milligrams of calcium.
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3 years ago
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Which statement is true?
Taya2010 [7]

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The sum of 78 and -78 is zero.

Step-by-step explanation:

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2 years ago
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- Why is R2 important? in multiple regression ​
andriy [413]

Answer:

R-squared is a statistical measure of how close the data are to the fitted regression line.

Step-by-step explanation:

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4 0
3 years ago
-7.4r - 6.31 = 3.23 - 5.6r
nikdorinn [45]

Answer:

r=−5.3

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

−7.4r−6.31=3.23−5.6r

−7.4r+−6.31=3.23+−5.6r

−7.4r−6.31=−5.6r+3.23

Step 2: Add 5.6r to both sides.

−7.4r−6.31+5.6r=−5.6r+3.23+5.6r

−1.8r−6.31=3.23

Step 3: Add 6.31 to both sides.

−1.8r−6.31+6.31=3.23+6.31

−1.8r=9.54

Step 4: Divide both sides by -1.8.

−1.8r/−1.8=9.54/−1.8

r=−5.3

4 0
2 years ago
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