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3 years ago

Help I don’t know it please

Mathematics

1 answer:

fiasKO [112]3 years ago

8 0

Answer:

For every 2 nevah has, jackson has 3 followers

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Round the number 8.946 to the nearest tenth

Mumz [18]

Answer:

8.9

Step-by-step explanation:

Because it is a 4, round down.

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3 years ago

Write 35 weeks as a number of years

arsen [322]

Since there are 52 weeks in a year, we can display this as a fraction.

So,
35/52

Hope this helps!

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3 years ago

A statistics teacher announces to the class at the beginning of the semester that there is a 40% chance that a randomly chosen s

adelina 88 [10]

Answer:

c. No, because the chance of getting an A on a test and getting an A in the class are not independent.

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2 years ago

Which of the following units would be most appropriate to measure the height of a 20-story building?

Over [174]

Answer: it is miles bc centimeters and meters are too small

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2 years ago

F(x) = lnx/x

My name is Ann [436]

$f(x) = \frac{lnx}{x}$

(a) $f'(x) = \frac{d}{dx}[\frac{lnx}{x}]$
Using the quotient rule:
$f'(x) = \frac{\frac{1}{x} \cdot x - lnx}{x^{2}}$
$f'(x) = \frac{1 - lnx}{x^{2}}$

For maximum, f'(x) = 0;
$\frac{1 - lnx}{x} = 0$
$lnx = 1, x = e$

(b) <em>Deduce:
</em> $e^{x} \geq x^{e}, x > 0$
<em>
Soln:</em> Since x = e is the greatest value, then f(e) ≥ f(x) > f(0)
$\frac{ln(e)}{e} \geq \frac{lnx}{x}$
$\frac{1}{e} \geq \frac{lnx}{x}$ , since ln(e) is simply equal to 1

Now, since x > 0, then we don't have to worry about flipping the signs when multiplying by x.
$\frac{x}{e} \geq lnx$
$x \geq elnx$
$x \geq ln(x^{e})$

Taking the exponential to both sides will cancel with the natural logarithmic function in the right hand side to produce:
$e^{x} \geq e^{ln(x^{e}})$
$e^{x} \geq x^{e}$ , as required.

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2 years ago