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3 years ago

Please answer need help for a quiz will give brainliest answer

Mathematics

2 answers:

nikitadnepr [17]3 years ago

8 0

I believe it’s D

if wrong let me know!

Advocard [28]3 years ago

6 0

Answer:

b its b put all together

Step-by-step explanation:

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Pls help not really getting this

LenaWriter [7]

A proper fraction is a fraction such as 3/5, or 2/4, any fraction where the numerator is less than the denominator. Then it says "the whole is divided into an even number of equal parts, and an odd number of those parts exists." Such as 1 3/5. From my understanding, you then divide by 2, which would give you 0.8, which could then be turned into 0.4 if that's what your teacher wants you to do. In the end, there will be no odd number.

8 0

3 years ago

A researcher is interested in looking at a new type of insulin that can treat diabetics with high fasting glucose levels. Suppos

Makovka662 [10]

Answer:

The sample size should be at least 79.

Step-by-step explanation:

Let Y be be the resting glocose level of a member of the population chosen randomly, then Y is a random variable with unkown mean λ and Standard deviation σ = 27.

Let X be the sample mean of a sample of lenght n. X has the same mean as Y and the standard deviation is $\sigma = \frac{27}{\sqrt{n}} .$

If n is reasonable high, the Central Limit Theorem states that X has distribution approximately Normal, with mean λ and Standard deviation $sigma = \frac{27}{\sqrt{n}} .$

If we standarize X, we get a random variable W

$W = \frac{X-\lambda}{\frac{27}{\sqrt{n}}} \simeq N(0,1)$

The values of W are tabulated and can be found on the attached file. We want a 95% confidence interval, so we want Z such that

P(-Z < w < Z) = 0.95

Using the symmetry of the normal density function, we get that

P(W < Z) = 0.975

If we look at the table, we will find that Z = 1.96, therefore we have

$P(-1.64 < \frac{X-\lambda}{\frac{27}{\sqrt{n}}} < 1.64) = 0.95$

Equivalently,

$0.95 = P(-1.64*\frac{27}{\sqrt{n}} < X- \lambda < 1.64*\frac{27}{\sqrt{n}})$

Taking out the X and the sign, after reverting the inequalities, we obtain

$P(X -1.64*\frac{27}{\sqrt{n}} < \lambda < X +1.64*\frac{27}{\sqrt{n}}) = 0.95$

Thus, a confidence interval with 95% confidence is

$CI = [ X-1.64*\frac{27}{\sqrt{n}}, X+1.64*\frac{27}{\sqrt{n}}]$

The (absolute) margin of error of this interval is $1.64*\frac{27}{\sqrt{n}} ,$ we want that number to be at most 5, so we take n such that

$1.64*\frac{27}{\sqrt{n}} = 5 \, \rightarrow \frac{1}{\sqrt{n}} = \frac{5}{1.64*27} \, \rightarrow \sqrt{n} = 8.85 \, \rightarrow n = 78.42$

We take n = 79. I hope that works for you!

Download pdf

4 0

3 years ago

What is the simplified expression for the expression below? -1/5(5x+20)-1/4(4x-28)

e-lub [12.9K]

You need to distribute the numerical factors for each term in the parenthesis:

$\dfrac{-1}{5}(5x+20)-\dfrac{1}{4}(4x-28) = \dfrac{-1}{5}\cdot 5x + \dfrac{-1}{5}\cdot 20 + \dfrac{-1}{4} \cdot 4x + \dfrac{-1}{4} \cdot (-28)$

This equals

$-x-4-x+7 = -2x+3$

7 0

3 years ago

Read 2 more answers

Find an equation of the tangent to the curve at the point corresponding to the given value of the parameter. x = t7 + 1, y = t8

Jet001 [13]

I must assume that you meant t=1 (not t=?1). If t=1, here's what we'd do:

1. Find the x and y values corresponding to t=1. They are:
x=(1)^7+1=2 and y=(1)^8+1=2. (Please note: write t^8 instead of t8, and write t^7 instead of t7.)
2. The slope of the tangent line to the graph is
dy/dt 8t^7+1
dy/dx = ---------- = ---------------- with 1 substituted for t
dx/dt 7t^6

Thus, dy/dx (at t=1) = 9/7

3. Now we have both a point (2,2) on the graph and the slope of the tangent line to the curve at that point: 9/7

4. The tangent line to the curve at (2,2) is found by using the point-slope formula:

y-y1 = m(x-x1)

which comes out to y-2 = 9/7(x-2), or 7y-14 = 9(x-2). You could, if you wished, simplify this result further (e. g., by solving for y in terms of x).

8 0

3 years ago

Scale the numerator and the denominator down by a factor of 4 (divide) to write a fraction equivalent to 24 56

lesantik [10]

The fraction equivalent to 24 /56 is 6/14.

<h3>What is fraction?</h3>

A fraction having whole numbers for the numerator and denominator. A fraction is a number of the form: ab where a and b are integers and b≠0. It represents the division of two numbers.

Given:

Scale the numerator and the denominator down by a factor of 4.

According to given question we have

Down by a factor of 4 means divide by 4.

when you scale the numerator and denominator down by 4, you just divide both of them by 4.

So since 24 divided by 4 is 6 and 56 divided by 4 is 14,

The answer is 6/14.

Therefore, the fraction equivalent to 24 /56 is 6/14.

Learn more details about fraction here:

brainly.com/question/10354322

#SPJ1

7 0

1 year ago