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Vilka [71]
2 years ago
6

Will mark brainliest ❤️

Mathematics
2 answers:
ddd [48]2 years ago
8 0

Answer:

See below

Step-by-step explanation:

5^{-3} - When you are raising a number to a negative power, it is the same as dividing 1 by that power when it is positive. So, 5^{-3} can be written as: \frac{1}{5^{3}}.

5^3 is 125, so we can substitute that in to get: \frac{1}{125}

-5^{-3} - This expression is the same as the one before, but it is negative. This means we can say -5^{-3} = -\frac{1}{125}

(-5^{-3})^{-1} - We can start by writing -5^{-3} as -1 * 5^{-3}. Now, we can distribute the exponent -1, and simplify. Remember when raising a power in parenthesis to another power, you multiply them:

(-1 * 5^{-3})^{-1}\\(-1)^{-1} * (5^{-3})^{-1}\\-1*5^3\\-1*125\\-125

(-5^{-3})^0 - We can start by writing -5^{-3} as -1 * 5^{-3}. Now, we can distribute the exponent 0, and simplify:

(-1*5^{-3})^0\\(-1)^0 * (5^{-3})^0\\1 * 1\\1

irakobra [83]2 years ago
3 0

Answer:

1/125, -1/125, -125, 1

Step-by-step explanation:

1. 5^-3 = 1/5^3 = 1/125

2. -5^-3 = 1/-5^3 = -1/125

3. Take the answer above, its the first part of the question; (-1/125)^-1 = -125

4. Any real number raised to the 0th power is one.

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horsena [70]

Answer:

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2 years ago
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Which of the following expressions is 0.00012 written in scientific notation? A. 0.12 × 10^-3 B. 1.2 × 10^-4 C. 12 × 10^-5 D. 1.
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Answer:

B. 1.2 x 10^{-4}

Step-by-step explanation:

Scientific notation is a way of writing very large or very small numbers. A number is written in scientific notation when a number between 1 and 10 is multiplied by a power of 10. For example, 650,000,000 can be written in scientific notation as 6.5 ✕ 10^8.  Or, in this case it's the opposite since we have a negative number. Since it's a decimal it's multiplied by 10 still but the exponent is negative. All we need to do to find what the exponent would be in this case is to count the number of zeros before the "12." There are 4 zeros before the 12. So your exponent would be -4. Now all we need to do is write out "equation" per say.

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<u>Hope this helps and have a nice day!</u>

5 0
2 years ago
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An equation is shown below:
IrinaK [193]
5(2x - 8) + 15 = -15
               -15      -15     subtract 15 from each side
5(2x - 8) = -30
  ÷5             ÷5             divide both sides by 5
2x - 8 = -6
     +8    +8                   add 8 to each side
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Checking:
5(2(1)-8) + 15 = -15
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