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Iteru [2.4K]
2 years ago
7

WORTH 20

Mathematics
1 answer:
Viktor [21]2 years ago
5 0

(2·3.5 + 4·3.25 + 2·1.9 + 1·1.2)·(1 - 0.05) = $23.75

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The area of a rectangle is 72 square metres. The length of the rectangle is twice the width. Find the width of the rectangle.
Maksim231197 [3]
Answer: Width = 6m

Working:
Find common factors of 72:
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

Work out which ones multiply together to make 72 and as the question states that the length is twice the width, we need to find two numbers that multiply to make 72 and one of the numbers is double the other number.

These numbers would be 6 and 12. (6 x 12 = 72)

Therefore:

Area = 72m²
Width = 6m
Length = 12m
6 0
2 years ago
A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only
makvit [3.9K]

Answer:

The sample size is  n = 3139    

Step-by-step explanation:

From the question we are told that

   The margin of error is  E = 0.02

From the question we are told the confidence level is  97.5% , hence the level of significance is    

      \alpha = (100 - 97.5% ) \%

=>   \alpha = 0.025

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } = 2.241

Generally we will assume the sample proportion to be \^ p = 0.5

Generally the sample size is mathematically represented as  

    n = [\frac{Z_{\frac{\alpha }{2} }}{E} ]^2 * \^ p (1 - \^ p )

=>  n = [\frac{2.241}{0.02} ]^2 *0.5 (1 - 0.5 )

=>  n = 3139    

   

7 0
2 years ago
ABC
aev [14]

Answer:

A

Step-by-step explanation:

If 50 is the diameter that thr radius is 25 and the equation to find the area of a circle is pi(r^2). So you would do pi(25^2) and that is 1963

4 0
2 years ago
Gabriela is 4 times as old as Vanessa. 10 years ago, Gabriela was 9 times as old as Vanessa. How old is Vanessa now?
Rus_ich [418]
Vanessa is 16. When she was 6, he was 54, ten years later he's 64 and she's now 16.
5 0
3 years ago
Michaela has h hair ties. Michaela's sister has triple the number of hair ties that Michaela has . Choose the expression
UkoKoshka [18]

Answer:

D

Step-by-step explanation:

Triple means 3 times something. "Times" means multiplication and the "something" is h so the answer is 3 * h = 3h.

5 0
2 years ago
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