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3 years ago

Two times a number, x, plus 3 times a number, y, equals 50. Four times x minus 2 times y equals 4. What are the numbers?

1 answer:

6 0

The answer should be D. If you plug it in,

-11 x 2 = -22 24 x 3 = 72

72 -22 = 50

4 x -11 = -44 2 x 24 = 48

48 -44 = 4

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2 years ago

How do I work this out?

galben [10]

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2 years ago

A sample proportion of 0.44 is found. To determine the margin of error for this statistic, a simulation of 100 trials is run, ea

salantis [7]

Answer:

margine of error = $\pm$ 0.13

Step-by-step explanation:

given data

sample proportion = 0.44

simulation trials = 100

sample size = 100

point estimate = 0.44

minimum sample proportion = 0.32

maximum sample proportion = 0.50

solution

we will get here first z score that is express as

$z = \frac{x-\mu }{\sigma }$ ............1

here x = 0.32and 0.50

$\mu = 0.44\\\sigma = \frac{x(max) - x(min)}{4} \\\sigma = \frac{0.50 - 0.32)}{4} = 0.045$

so z will be

$z1 = \frac{0.50 - 0.44 }{0.045 } = 1.35\\z2 = \frac{0.32 - 0.44 }{0.045 } = -2.66$

so now we get here margin of error that is express as

margin of error = $\pm \ z \times \sqrt{\frac{p(1-p)}{n}}$ ................2

we use here z heighervalue

margin of error = $\pm \ 2.66 \times \sqrt{\frac{0.44(1-0.44)}{100}}$

margine of error = $\pm$ 0.13

8 0

3 years ago

Read 2 more answers

Find the product of (x − 3)^2. <br> x^2 + 6x + 9 <br> x^2 − 6x + 9 <br> x^2 + 9 <br> x^2 − 9

topjm [15]

The answer is B :)
Have a nice day

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2 years ago

Of 212 consumers polled, some like only animated movies, some prefer just musicals, and some like both. If 74 people like only a

iogann1982 [59]

52 people like only musicals.

There are 212 people. We know that the only answers were only animated movies, only musicals, or both. We also know that 74 people like only animated movies, and 86 people like both. To find the number that like only musicals, subtract these from the total number of people:

212-(74+86) = 212-160 = 52

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2 years ago