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miss Akunina [59]
2 years ago
6

Estimate 8,109-4,228 by first rounding each number to the nearest hundred.

Mathematics
1 answer:
HACTEHA [7]2 years ago
7 0

Answer: 8109-4228.00

Step-by-step explanation: I'm big brain

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-7d > 21
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Remember the sign flips when you multiply or divide by a negative number.
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Solve the following systems of equations. Express your answer as an ordered pair in the format (a,b), with no spaces between the
kodGreya [7K]

Answer:

(4, 1)

Step-by-step explanation:

3x+4y=16 /*4

-4x-3y= - 19 /*3

 12x + 16y = 64

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            7y = 7

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3x+4y=16

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4 0
3 years ago
2/5 × 6/7= simplify form​
kirill115 [55]

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2 x 6 = 12

5 x 7 = 35

12/35

Step-by-step explanation:

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3 years ago
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HELPP I don’t get this at all. I originally got c but my teacher said it was incorrect. This is about volume and cylinders. Expl
EastWind [94]

Answer:

B

Step-by-step explanation:

The formula for the volume of a cylinder is \pi r^2 h, where r is the radius of the base and h is the height of the cylinder.

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3 years ago
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A teacher was interested in knowing the amount of physical activity that his students were engaged in daily. He randomly sampled
klasskru [66]

Answer:

The standard error of the mean is 4.5.

Step-by-step explanation:

As we don't know the standard deviation of the population, we can estimate the standard error of the mean from the standard deviation of the sample as:

\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}

The sample is [30mins, 40 mins, 60 mins, 80 mins, 20 mins, 85 mins]. The size of the sample is n=6.

The mean of the sample is:

\bar{x}=\frac{1}n} \sum x_i =\frac{30+40+60+80+20+85}{6}=52.5

The standard deviation of the sample is calculated as:

s=\sqrt{\frac{1}{n-1}\sum (x_i-\bar x)^2} \\\\ s=\sqrt{\frac{1}{5}\cdot ((30-52.5)^2+(40-52.5)^2+(60-52.5)^2+(80-52.5)^2+(20-52.5)^2+(85-52.5)^2}\\\\s=\sqrt{\frac{1}{5} *3587.5}=\sqrt{717.5}=26.8

Then, we can calculate the standard error of the mean as:

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