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3 years ago

7 is not an example of A) a variable B) an expression C) a constant D) a term

Mathematics

2 answers:

Varvara68 [4.7K]3 years ago

6 0

Answer:

A) a variable

Step-by-step explanation:

A) a variable a variable changes value 7 does not change

B) an expression does not have an equal sign 7 does not have an equal sign

C) a constant 7 is constant, it does not change

D) a term is a group of numbers and variables with no operators

insens350 [35]3 years ago

6 0

Answer:

7 is not an example of a variable.

Step-by-step explanation:

7 is not an example of a variable. 7 is a constant (C), and could be an expression or a term.

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A cheese processing company wants to estimate the mean cholesterol content of all one-ounce servings of a type of cheese. The es

Mrrafil [7]

Answer:

The minimum sample size required to construct a 95% confidence interval for the population mean is 65.

Step-by-step explanation:

We are given the following in the question:

Population standard deviation,

$\sigma = 3.10\text{ milligrams}$

We need to construct a 95% confidence interval such that the estimate is within 0.75 milligrams of the population mean.

Thus, the margin of error must me 0.75

Formula for margin of error:

$z_{critical}\times \dfrac{\sigma}{\sqrt{n}}$

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

Putting values, we get,

$0.75 = 1.86\times \dfrac{3.10}{\sqrt{n}}\\\\\sqrt{n} = \dfrac{1.96\times 3.10}{0.75}\\\\\sqrt{n} = 8.101\\\Rightarrow n = 65.63\approx 65$

Thus, the minimum sample size required to construct a 95% confidence interval for the population mean is 65.

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3 years ago

Of all rectangles with a perimeter of 7, which one has the maximum area? (give the dimensions.)

Elena L [17]

The rectangle with maximum area will actually be a square.

Each side will be of length 7/4 = 1 3/4.

3 0

3 years ago

Emily, Carl and Antony altogether has 121 stamps. How many stamps doeas each of them have, if it is known, that Emily has 40% mo

Leviafan [203]

Answer:

Step-by-step explanation:

1. First, put together the information we have. Total = 121. Emily has 40% more than Carl, and Carl has 60% more than Antony.

2. Next, set each person as a variable. Antony = x. Carl = 1.6x. Emily = 1.4 times 1.6x.

3. Next, form an equation using these variables.

x + 1.6x + (1.4 x 1.6x) = 121

x + 1.6x + 2.24x = 121

4.84x = 121

x = 25

4. Finally, plug in x to our previous variables in step #2 to find the number of stamps Emily and Carl have.

Antony: x = 25 stamps

Carl: 1.6x = 40 stamps

Emily: 1.4 times 1.6x = 56 stamps

By the way, is this for RSM? If so, I am working on that problem right now and I searched up the solution but couldn't find it, so I stumbled upon this. I hope this helped!

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3 years ago

Lập bảng biến thiên và tìm tập giá trị của y=2x-4

Nikitich [7]

The answer is -8 (-8=2*-4)

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2 years ago

Lines k and l are parallel. Lines m and n intersect lines k and l to form 2 triangles. The top triangle has angles 1, 2, 3. The

GaryK [48]

Answer:

It is C, line KL has a slope of 0 and line MN is undefined and they're perpendicular

Step-by-step explanation:

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3 years ago

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