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almond37 [142]
4 years ago
9

Explain how to use properties to prove d + (8d + 1) + 7 is equivalent to 8 + 9d.

Mathematics
2 answers:
marshall27 [118]4 years ago
6 0

Answer:

Exact response: Use the associative property to move the parentheses, and the expression becomes (d + 8d) + 1 + 7. Combine like terms, and the expression becomes 9d +8. Use the commutative property to change the order of the terms, and the expression becomes 8 + 9d.

Damm [24]4 years ago
3 0

Answer:

Use the associative property to move the parentheses, and the expression becomes (d + 8d) + 1 + 7. Combine like terms, and the expression becomes 9d +8. Use the commutative property to change the order of the terms, and the expression becomes 8 + 9d.

Step-by-step explanation:

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2xB+4= -8<br> what number does B stand for in the question
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2 x B + 4 = -8
          -4      -4
2 x B = -12
divide by 2 on both sides
B = -6
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4 years ago
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Leona is having a birthday party on Sunday. Jeanette wants to know how many people will be coming. Leona tells her that there wi
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Answer:77 and 87

Step-by-step explanation:

7×6=42 + 5+7=35/\ 35+42=77(first outcome)

7×6=42 + 5×9=45/\42+45=87 (second outcome.

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3 years ago
Gareth selected a tile randomly from the set shown below. What is the probability that he selected a yellow tile or a tile with
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Answer:

D. 19/30

Step-by-step explanation:

count how many tiles there are and then count how many yellow tiles and odd tiles there are. add the number yellow and odd tiles together and divide the sum by how many tiles there are.

60 tiles

3 yellow tiles

35 odd tiles

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4 years ago
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Which number is greater than 7.23 and less than 7.55? 7.59;7.17;7.6;7.3
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5 0
3 years ago
In order to estimate the mean amount of time computer users spend on the internet each​ month, how many computer users must be s
Sladkaya [172]

Answer:

The minimum sample size required is 5,499 computer users.

The major obstacle is that it is a big sample size if it is a small organization wanting to perform it.

Step-by-step explanation:

We need to calculate a sample size in order to have 95% confidence interval with 12 minutes of witdth.

So, we have that the difference between the upper limit and the lower limit is 12:

UL-LL=12

(\mu+z*\sigma/\sqrt{n})-(\mu-z*\sigma/\sqrt{n})=12\\\\2z\sigma/\sqrt{n}=12\\\\\sqrt{n}=(1/6)*z\sigma\\\\n=(1/36)z^2\sigma^2

For a 95% CI, the value of z is 1.96. The standard deviation is 227.

n=z^2\sigma^2/36=(1.96)^2*(227)^2/36=3.8416*51,529/36=5498.72\\\\n=5499

The minimum sample size required is 5,499 computer users.

6 0
3 years ago
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