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3 years ago

Hello can you please help me posted picture of question

Mathematics

1 answer:

ollegr [7]3 years ago

7 0

The correct option is (B) 4x^2 + 18x + 18

Explanation:
The area is given as:
(3+2x)(6+2x)

To find the polynomial just simplify it.
3(6+2x) + 2x(6+2x)

18 + 6x + 12x + 4x^2

4x^2 + 18x + 18

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A news agency publishes results of a recent poll. It reports that candidate A leads candidate B by 10% because 45% of the poll p

natali 33 [55]

We need to use the formula to find Margin of Error but through the sample proportion, that is

$E=z*\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$

We will use a 95% confidence interval, that is a z value of 1.96 (Search in a Normal distribution table)

A) For A our $\hat{p}$ (proportion) is equal to 0.45. So applying the formula,

$E=1.96*\sqrt{\frac{0.45(1-0.45)}{900}}$

$E=3.25\%$

B) We make the same of point A, but change our proportion to 0.35

$E=1.96*\sqrt{\frac{0.35(1-0.35)}{900}}$

$E=3.116\%$

c) We need to calculate the SE through proportion for 0.1, that is

$SE = \sqrt{(\frac{\hat{p_1}(1-\hat{p_1})}{n})+(\frac{\hat{p_2}(1-\hat{p_2})}{n})}$

Then our Error is given by,

$E=z*SE$

$E=1.96*\sqrt(0.45*\frac{0.55}{900}+0.35\frac{0.65}{900}$

$E=0.045$

7 0

3 years ago

For each reaction between a ketone and an amine, draw the curved arrow(s) to show the first step of the mechanism, then draw the

Ray Of Light [21]

Answer:

Step-by-step explanation:

Aromatic amine is generally less nucleophilic than aliphatic amine because of the aromatic delocalisation of the lone pair. Ketones are also less reactive compared to aldehyde and Reaction between aromatic amine and aromatic ketone is possible leading to the formation of Schiff's base in aqeous ethanoic solution.

6 0

2 years ago

A sprinter started his race slowly and then increase his speed by 12.5 miles per hour to reach a top speed of 21 miles per hour

IRINA_888 [86]

21 mph - 12.5 mph = 8.5 mph

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3 years ago

If you were to use the substitution method to solve the following system, choose the new

mestny [16]

Answer:

23x = -115

Step-by-step explanation:

In the substitution method, you must solve for 1 variable in 1 equation to replace it in the other equation. For the system:

2x - 7y = 4

3x + y = -17

Solving for y in the second equation:

y = -17 - 3x

Replacing y in the first equation:

2x - 7(-17 - 3x) = 4

2x + 119 + 21x = 4

23x = -115

This is the new equation after use the substitution method.

5 0

3 years ago

Question 23(Multiple Choice Worth 1 points) (05.05 MC) Find the area of a triangle with a base length of 4 units and a height of

Ymorist [56]

20 area is width (base) times heighth

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2 years ago