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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.

You might be interested in
Look at the picture as I can’t type the whole thing
bija089 [108]

Answer:

23.1 hours

Step-by-step explanation:

the mean is calculated as

mean = ∑ fx ÷ ∑ f

where x is the midpoint of the time intervals

0 < h ≤ 10 ⇒ x = 5

10 < h ≤ 20 ⇒ x = 15

20 < h ≤ 30 ⇒ x = 25

30 < h ≤ 40 ⇒ x = 35

then

∑ fx = (5 × 5) + (15 × 15) + (50 × 25) + (10 × 35)

       = 25 + 225 + 1250 + 350

       = 1850

∑ f = 5 + 15 + 50 + 10 = 80

then

mean = 1850 ÷ 80 ≈ 23.1 hours (to 1 dp )

8 0
2 years ago
3/5 of a number is 21<br><br>Find the number. ​
Svet_ta [14]

Answer:

35

Step-by-step explanation:

if you divide 21 by 3, which is 7, then multiply that number by 5, it gives you thirty five then you can go back and check your work, 35/5 times 3

6 0
3 years ago
How would I solve this?? 5p-8(p+1)&gt;16
alexandr402 [8]

<em>*To solve inequalities is similar to solving equations: isolate the desired variable to one side.</em>

So firstly, distribute -8 to (p + 1):

5p-8p-8>16

Next, combine like terms:

-3p-8>16

Next, add 8 to both sides:

-3p>24

Lastly, divide both sides by -3. Now since you are dividing by a <u>negative</u>, you will be flipping the inequality symbol as well.<u> Your final answer will be p</u>

6 0
3 years ago
Write the fractional equivalent (in reduced form) to each number 30 points
tankabanditka [31]
Correct answers are:

1)    1/3 (NOT 3/10).  .3 repeating is not 3/10, 3/10 is .3.
2)    1/8.  To solve, .125 has three places, so use 1000.  1000/125 is 8, that is your denominator.  125/125 is 1 is your numerator.
3)    1/6 (divide 100/16, which is 6 ¼ - round to 6.  If you carry this out to 1,000,000/166,667, it is very close to 6.
4)    1/10
5)    2/3 (NOT 3/5)
6)    1/5 (2/10 reduced to 1/5)
7)    3/4 (75/100 reduced)


<span />
7 0
3 years ago
28 -4a = 3a -14+2a<br> ------
Greeley [361]
24+14 = 3a + 4a +2a
38 = 9a
——————————
Hope it is helpful.
6 0
3 years ago
Read 2 more answers
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