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Butoxors [25]
3 years ago
7

Evaluet 2-(4-x) when x=-5​

Mathematics
1 answer:
attashe74 [19]3 years ago
5 0
The answer is -18 because 2-(4--5) you add 4+5 then you get 2-(9) distribute the negative and then multiply by two to get -18
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Evaluate the expression. 1/2 - 4 (1/2 + 1)^2
insens350 [35]

Answer:

D. -17/2

Step-by-step explanation:

1/2 - 4 (1/2 + 1)^2

First we evaluate what is inside the parentheses

1/2 - 4  (3/2) ^2

Now we square what is inside the parentheses

1/2 - 4(9/4)

Now multiply

1/2 -9

Get a common denominator  9 = 9 *2/2 = 18/2

1/2 - 18/2

-17/2


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8.
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Answer:

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Step-by-step explanation:

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add all the number

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The following table gives the scores of 30 students in a mathematics examination. Scores 90–99 80–89 70–79 60–69 50–59 Students
Pavel [41]
The given data is
Scores:      90-99  80-89  70-79  60-69  50-59
Students:   3          7           12        4          4
Because we are to take the middle value for each group.
Therefore the total score is
Sx = 3*94.5 + 7*84.5 + 12*74.5 + 4*64.5 + 4*54.5 = 2245
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The mean is
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Calculate (Sx - m)² 
(Sx - m)² = 3*(94.5-74.833)² + 7*(84.5-74.833)² + 12*(64.5-74.833)²
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Calculate the standard deviation
s = √(3896.7/29) = 11.592

Answer:
mean = 74.83
std. deviation = 11.59
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3 years ago
In 2010 the population of Alaska was about 710,200 what is this number written in word form?
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Answer:

seven-hundred thousand ten two-hundred

Step-by-step explanation:

8 0
3 years ago
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