3 years ago

Words of operations

Mathematics

1 answer:

Yuri [45]3 years ago

3 0

42 - 19 = 23
the difference between 42 and 19 is 23

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liq [111]

I think it’s none of those.
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3 years ago

it is 1,325 feet from kinsey's house to her friend carlito's house. when she visits carlito, she walks to his house and gets a r

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148,400 feet
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8 0

3 years ago

Find the inflection point of the function of f(x) = x³ -6x² +12x

Wewaii [24]

Points of inflections are zeroes of the second derivative. We have:

$f(x)=x^3-6x^2+12x\implies f'(x)=3x^2-12x\implies f''(x)=6x-12$

So, the second derivative equals zero if and only if

$f''(x)=0\iff 6x-12=0 \iff 6x=12 \iff x=2$

So, this is the only point of inflection of this function.

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3 years ago

Find the arc length (to the nearest inch) of the sector of a circle with a radius 14 inches and a central angle of 0=108°

forsale [732]

Length of arc=angleO/360×2pi×r
=108/360×22/7×14×14
=3/10×22×2×14
=66×2×14/10
=1848/10
=184.8inches

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4 years ago

One researcher wishes to estimate the mean number of hours that high school students spend watching tv on a weekday. a margin of

PtichkaEL [24]

Margin of error, e = Z*SD/Sqrt (N), where N = Sample population

Assuming a 95% confidence interval and substituting all the values;
At 95% confidence, Z = 1.96

Therefore,
0.23 = 1.96*1.9/Sqrt (N)

Sqrt (N) = 1.96*1.9/0.23

N = (1.96*1.9/0.23)^2 = 262.16 ≈ 263

Minimum sample size required is 263 students.

3 0

3 years ago

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