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3 years ago

-2(-3n

2)}^{2} " alt=" - 2( - 3n {2)}^{2} " align="absmiddle" class="latex-formula">
2)2

Mathematics

1 answer:

seropon [69]3 years ago

8 0

Answer:

1234567890

Step-by-step explanation:

`1234567890

`12

34567890-

fghjklkjhjkl;

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Answer:

x is greater than or equal to -3

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3 years ago

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I’m stuck, HELP 3(6) + 4(2)^3 - 5

Slav-nsk [51]

Answer:

Step-by-step explanation:

Lets split the problem then add/subtract at the end

3 x 6 = 18

Due to Order of operations we do 2^3 first then multipy by 4

so 2^3 = 8 Then we do 8 x 4 = 32

Now we add/subtract

18 + 32 - 5 = 45

45 is the answer

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Help answer and EXPLAIN STEP BY STEP

pychu [463]

15. $(-k^{3} -5k^{2} + 1) - (6k^{3}-k^{2} -2)$

Step 1: Distribute the subtraction sign to all the numbers in the second set of parentheses...

$(-k^{3} -5k^{2} + 1) - (6k^{3}-k^{2} -2)$

$-k^{3} -5k^{2} +1 - 6k^{3} +k^{2} +2$

Step 2: Combine like terms ( $k^{2}$ 's go with $k^{2}$ 's)

$-k^{3} -5k^{2} + 1 - 6k^{3}+k^{2} +2$

$-5k^{2} +k^{2}$

$-4k^{2}$

$-k^{3} -4k^{2} + 1 - 6k^{3}+2$

Step 3: Combine like terms ( $k^{3}$ 's go with $k^{3}$ 's)

$-k^{3} -4k^{2} + 1 - 6k^{3}+2$

$-k^{3} + (- 6k^{3})$

$-7k^{3}$

$-7k^{3} -4k^{2} + 1 +2$

Step 4: Combine like terms (normal numbers go with normal numbers)

$-7k^{3} -4k^{2} + 1 +2$

1 + 2

$-7k^{3} -4k^{2} + 3$

You were correct!

16. $49m^2 - 84mn + 36n^2$

I don't really know how to explain this one but I got: (7m-6n)(7m-6n)

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4 years ago

Simplify (4xy)(2x2y)(3xy)3 24x^2y^3 24x^6y^5 216x^3y^3 216x^6y^5

Genrish500 [490]

Answer:

The final answer is D. 216 x⁶ y⁵

Step-by-step explanation:

Let's simplify the expression, this way:

1. Start with the coefficients:

4 * 2 * 3³

4 * 2 * 27

216

2. Variable x:

We have x * x² * x ³ = x¹⁺²⁺³ = x⁶

x⁶

3. Variable y:

We have y * y * y³ = y¹⁺¹⁺³ = y⁵

y⁵

4. Adding the pieces:

We put coefficients and variables together: 216 x⁶ y⁵

The final answer is D. 216 x⁶ y⁵

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3 years ago

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A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only

Snezhnost [94]

Answer:

At sample size of 752 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

What size of sample is needed?

A sample size of n is needed.

n is found when M = 0.03.

We do not have a estimate for the true proportion, so we use $\pi = 0.5$ , which is when we are going to need the largest sample size.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.645\sqrt{\frac{0.5*0.5}{n}}$

$0.03\sqrt{n} = 1.645*0.5$

$\sqrt{n} = \frac{1.645*0.5}{0.03}$

$(\sqrt{n})^{2} = (\frac{1.645*0.5}{0.03})^{2}$

$n = 751.67$

Rounding up

At sample size of 752 is needed.

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3 years ago