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3 years ago

Find the sum of the given polynomials.

Mathematics

2 answers:

notka56 [123]3 years ago

7 0

Answer is B.............

Maslowich3 years ago

6 0

(5m + 2n) + (-3m + n) + (-3n + 7)
(5m - 3m) + (2n + n - 3n) + 7
2m + (3n - 3n) + 7
2m + 7

The answer is B.

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Solve for r. 35r-21<-35r+19

Mnenie [13.5K]

Good morning ☕️

Answer:

$r < \frac{4}{7}$

Step-by-step explanation:

35r-21 < -35r+19

⇌ 35r + 35r < 19 + 21

⇌ 70r < 40

⇌ r < 40/70

⇌ r < 4/7

_________________________

5 0

4 years ago

Brewed decaffeinated coffee contains some caffeine. We want to estimate the amount of caffeine in 8 ounce cups of decaf coffee a

rusak2 [61]

Answer:

We would have to take a sample of 62 to achieve this result.

Step-by-step explanation:

Confidence level of 95%.

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.

Assume that the standard deviation in the amount of caffeine in 8 ounces of decaf coffee is known to be 2 mg.

This means that $\sigma = 2$

If we wanted to estimate the true mean amount of caffeine in 8 ounce cups of decaf coffee to within /- 0.5 mg, how large a sample would we have to take to achieve this result?

We would need a sample of n.

n is found when $M = 0.5$ . So

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

$0.5 = 1.96\frac{2}{\sqrt{n}}$

$0.5\sqrt{n} = 2*1.96$

Dividing both sides by 0.5

$\sqrt{n} = 4*1.96$

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

$n = 61.5$

Rounding up

We would have to take a sample of 62 to achieve this result.

8 0

3 years ago

Which graph shows a dilation? On a coordinate plane, 2 triangles are shown. The smaller triangle has points (negative 2, 0), (ne

allochka39001 [22]

Answer:

its D

Step-by-step explanation:

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3 years ago

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Simplify 4+2 squared

Tanya [424]

4+2^2
=4+(2×2)
=4+(4)
=4+4
=8

or

(4+2)^2
=(4+2) × (4+2)
=16+8+8+4
=36

hope this helps!! please make my answer brainliest to help me out, thx!!

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3 years ago

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The GRE is an entrance exam that most students are required to take upon entering graduate school. In 2014, the combined scores

Arturiano [62]

Yes i believe the answer is 289

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3 years ago

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