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3 years ago

Simplify the expression -4.6+( -1.4) .on the test , when maureen simplified the expression she got 3.2 .

Mathematics

1 answer:

Sav [38]3 years ago

4 0

Answer:

Step-by-step explanation:

-4.6+( -1.4)=

-4.6-1.4=-6 maureen is wrong, because both have the minus , so she should add with the minus symbol.

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Questions 4-6 thanks if you help

Ray Of Light [21]

Here's what I did which might help you

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2 years ago

Y=-1/4x+6 when y equals 4

timofeeve [1]

Answer:

Step-by-step explanation:

Y = -1/4x+6, when y= 4

Same as saying

4 = -1/4x+6 , where y = 4

Multiply both sides by (4x+6)

4(4x+6) = -1

Opening the parentheses

16x + 24 = -4

16x = -4-24

16x = -28

Divide both sides by 16

X = -28/16

X = - 7/4

Ans = -7/4

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3 years ago

A doctor at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she

Nataly_w [17]

Answer:

The minimum sample size needed is $n = (\frac{1.96\sqrt{\sigma}}{4})^2$ . If n is a decimal number, it is rounded up to the next integer. $\sigma$ is the standard deviation of the population.

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:

$\alpha = \frac{1 - 0.9}{2} = 0.05$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.05 = 0.95$ , so Z = 1.645.

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.

How large a sample must she select if she desires to be 90% confident that her estimate is within 4 ounces of the true mean?

A sample of n is needed, and n is found when M = 4. So

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

$4 = 1.96\frac{\sigma}{\sqrt{n}}$

$4\sqrt{n} = 1.96\sqrt{\sigma}$

$\sqrt{n} = \frac{1.96\sqrt{\sigma}}{4}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{\sigma}}{4})^2$

$n = (\frac{1.96\sqrt{\sigma}}{4})^2$

The minimum sample size needed is $n = (\frac{1.96\sqrt{\sigma}}{4})^2$ . If n is a decimal number, it is rounded up to the next integer. $\sigma$ is the standard deviation of the population.

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3 years ago

Four triangles are shown. One side of each triangle lies on a ray, and the triangles are not drawn to scale. Based on these tria

Firdavs [7]

Answer:

x=120 so the third one

Step-by-step explanation:

x=98+22

x=120

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2 years ago

Read 2 more answers

Find m<_6 if m<_8=120 degrees (show work if possible).

shepuryov [24]

Answer:

Step-by-step explanation:

i h you h we all h ya know

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3 years ago