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hodyreva [135]
3 years ago
12

Please help which property is illustrated by this example 0 = n . 0

Mathematics
1 answer:
PtichkaEL [24]3 years ago
6 0
The example illustrates the multiplication property of zero.
0=n*0
No matter what number is n, you will always get 0.
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A researcher surveyed 220 residents of a city about the number of hours they
olga55 [171]

Answer:

Margin of error of 0.0485 hours.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

In this question:

\sigma = 0.35, n = 220

The margin of error is of:

M = z\frac{\sigma}{\sqrt{n}}

M = 1.96\frac{0.35}{\sqrt{200}}

M = 0.0485

Margin of error of 0.0485 hours.

5 0
3 years ago
For history class, Joe spent 2 hours writing a 4-page report on ancient Egypt. This weekend, he needs to write a 12-page report
Natalka [10]

Answer:

2hours/4pages

2/4=1/2

1/2=x/12

cross multiply

12=2x

divide by 2 both sides

6=x

6 hours

3 0
3 years ago
Read 2 more answers
What is the area? Please help!!!
anyanavicka [17]

Answer: 96 ft²

Step-by-step explanation:

<u>This figure can be divided into two rectangles:</u>

  • The first rectangle has dimensions 6 ft by 14 ft.
  • The second rectangle had dimensions 4 ft by 3 ft.

<u />

<u>Find the area of both rectangles:</u>

  • The first rectangle: 6 × 14 = 84 ft²
  • The second rectangle: 4 × 3 = 12 ft²

<u />

<u>Add them together to find the total area of the figure:</u>

84 + 12 = 96 ft²

7 0
3 years ago
Under her cell phone plan, Lily pays a flat cost of $55.50 per month and $4 per
TEA [102]

Answer:

Equation : y = 4x + 55.50

x = 1.9 gigabytes

Step-by-step explanation:

Given that:

Flat fee per month = $55.50

Cost per gigabyte = $4

Let,

x be the number of gigabytes.

y be the total cost

y = 4x + 55.50

Lily wants to keep her bill $63.10

63.10 = 4x + 55.50

63.10 - 55.50 = 4x

4x = 7.60

Dividing both sides by 4

\frac{4x}{4} = \frac{7.60}{4}\\x=1.9

Hence,

Equation : y = 4x + 55.50

x = 1.9 gigabytes

8 0
3 years ago
Read 2 more answers
Find the area of the shaded region. use 3.14 for pi.
stepan [7]

Answer:

18 0 - 60 = 120 \\  \\  \frac{120}{360}  \times \pi {r}^{2}  \\  \frac{1}{3} \times 3.14 \times 4 \times 4 \\  = 16.75 {u}^{2}

<em>Answer</em><em> </em><em>B</em><em> </em><em>is</em><em> </em><em>correct</em><em>.</em>

8 0
3 years ago
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