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miss Akunina [59]
3 years ago
10

HELP PLEASE!!!

Mathematics
1 answer:
melamori03 [73]3 years ago
8 0

Answer: £30.20

We can say, 4kg of copper is mixed with 1kg of Zinc to make 5 kg of brass.

So to make 7 kg of brass we need to find out how much kg is copper and zinc mixed.                                                                                                                             Just increase one kg in both the weight, 5kg of copper and 2kg of zinc makes it 7kg of brass. (Technical thinking)

Now that we know the proportions of the metals so find out the costs of each kg of it.

Copper: 1 kg costs £5

              5kg costs-  5*5 --> £25

Zince: 1 kg costs £3.20

          2kg costs-  3.20 * 2 --> £5.20

Now add them, £5.20 + £25 --> £30.20

So, the cost of 7kg of brass is £30.20

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Hillary needs to know if the triangle shown is a right triangle. Which equation should she use to help?
Sonja [21]

Answer:

a2+b2=c2

Step-by-step explanation:

A right triangle is a triangle in which one of the angles is a 90∘ angle. A triangle can be determined to be a right triangle if the side lengths are known. If the lengths satisfy the Pythagorean Theorem (a2+b2=c2) then it is a right triangle.

7 0
3 years ago
A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a ne
Leto [7]

Answer:

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

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 z-score that has a p-value of 1 - \frac{\alpha}{2}.

Of the 533 randomly selected Americans surveyed, 351 were in favor of the initiative.

This means that n = 533, \pi = \frac{351}{533} = 0.6585

90% confidence level

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

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 - 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6247

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.6585 + 1.645\sqrt{\frac{0.6585*0.3415}{533}} = 0.6923

The 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative is (0.6247, 0.6923).

6 0
3 years ago
In 2015 Michael purchased a stock for $45.80 a share. During the year he received $1.71 per share in cash dividends. At the end
timama [110]
Michael's initial investment is $45.80, the cost of the share. 
Michael Receives $1.71 in dividends.
He receives $47.50 for the stock when he sells it.
His profit on the sale of the stock is $47.50 - 45.80 = $1.70.
His total return on the stock is his total earnings, the dividends plus his profits on the sale of the stock, divided on what he paid initially, $45.80:
(1.71 + 1.70) ÷ 45.80 = .0744 = 7.45%
7.45% return on investment in less than a year, not bad!
Closest answer is 7.7%, not sure why it isn't exactly 7.45 or 7.5%. 

Answer is B) 7.7%
7 0
4 years ago
Halp. Halp. Halp. Halp. Halp
RUDIKE [14]
The awnser is 145
(50 divided 2) = 25
5 to the power of 3= 125
-5
=145
3 0
4 years ago
Read 2 more answers
Which two intergers is 105 between?
Leviafan [203]

Answer:

106 and 107

Step-by-step explanation:

Integers are just numbers that doesn't have a decimal point.

1, 2, 3, 4, and 5 are integers.

1.123, 2.45312, 3.5, 7.9 are NOT integers

105 is between 106 and 107.

5 0
4 years ago
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