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3 years ago

Evaluate the expression when c=4. 4c−7.8 = ???????

Mathematics

2 answers:

vesna_86 [32]3 years ago

7 0

Answer:

8.2

Step-by-step explanation:

4(4)-7.8

ivanzaharov [21]3 years ago

7 0

So if c=4, the equation will be (4 × 4) - 7.8. Use PEMDAS (parenthesis, exponents, multiplication, division, addition, & subtraction) to solve.

4 × 4 = 16

16 - 7.8 = 8.2

<h2>Answer:</h2>

4(c) - 7.8 when c = 4 equals 8.2.

I hope this helps :)

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Step-by-step explanation:

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3 years ago

A sample of 25 undergraduates reported the following dollar amounts of entertainment expenses last year:

marin [14]

Answer:

$Range = 85$

$\sigma = 28.71$

$Interval = [666.78, 781.62]$

Step-by-step explanation:

Given

The data for 25 undergraduates

Solving (a): Range and Standard deviation

The range is:

$Range = Highest - Least$

From the dataset:

$Highest = 772$

$Least = 687$

So:

$Range = Highest - Least$

$Range = 772-687$

$Range = 85$

The standard deviation is:

$\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n}}$

First, calculate the mean

$\bar x = \frac{769 +691 +............+715}{25}$

$\bar x = \frac{18105}{25}$

$\bar x = 724.2$

So, the standard deviation is:

$\sigma = \sqrt{\frac{(769-724.2)^2 +(691-724.2)^2 +(699-724.2)^2 +(730-724.2)^2 +............+(715-724.2)^2}{25}}$

$\sigma = \sqrt{\frac{20604}{25}}$

$\sigma = \sqrt{824.16}$

$\sigma = 28.71$

Solving (b): The interval of the 95% of the observation.

Using the emperical rule, we have:

$Interval = [\bar x - 2*\sigma, \bar x+ 2*\sigma]$

$Interval = [724.2 - 2*28.71, 724.2 + 2*28.71]$

$Interval = [666.78, 781.62]$

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3 years ago

Help me out please i need help im usure whats the answer

kkurt [141]

The answer is 80 because the answer for all three sides should be 180

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3 years ago

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Chanda Spent $2.55 for three bottles of juice. Write and solve an equation to find the cost of 1 bottle

In-s [12.5K]

Answer: 0.85

Step-by-step explanation:

2.55/3

6 0

3 years ago

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