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2 years ago

What is 140 divided by 18 ??? someone please help

Mathematics

2 answers:

timofeeve [1]2 years ago

5 0

7.77777778 if you want you could put a line at the end and put 7.7^

seropon [69]2 years ago

3 0

You can't do 140 divided by 18
or it will end up like this 7.77777777778

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A hospital needs to dilute a 50% boric acid solution to make it a 10% boric acid solution. If it needs 25 liters of the 10% solu

saul85 [17]

I'm pretty sure the answer is 5 because I did 50% of 50 which is 5

7 0

2 years ago

PLEASE HELP ASAP

lesya692 [45]

Answer:

x^2+14x+49 ( it could be polynomial because it has 3 terms and each term has a whole number and a coefficient)

Step-by-step explanation:

(x+7)^2

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x^2+7x+7x+49

x^2+14x+49

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3 years ago

Find the midpoint of the line segment with the given end point. (7,2) and (9,-7).

valentina_108 [34]

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7 0

2 years ago

If x = a cosθ and y = b sinθ , find second derivative

Olin [163]

I'm guessing the second derivative is for y with respect to x, i.e.

$\dfrac{\mathrm d^2y}{\mathrm dx^2}$

Compute the first derivative. By the chain rule,

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{\mathrm dy}{\mathrm d\theta}\dfrac{\mathrm d\theta}{\mathrm dx}=\dfrac{\frac{\mathrm dy}{\mathrm d\theta}}{\frac{\mathrm dx}{\mathrm d\theta}}$

We have

$y=b\sin\theta\implies\dfrac{\mathrm dy}{\mathrm d\theta}=b\cos\theta$

$x=a\cos\theta\implies\dfrac{\mathrm dx}{\mathrm d\theta}=-a\sin\theta$

and so

$\dfrac{\mathrm dy}{\mathrm dx}=\dfrac{b\cos\theta}{-a\sin\theta}=-\dfrac ba\cot\theta$

Now compute the second derivative. Notice that $\frac{\mathrm dy}{\mathrm dx}$ is a function of $\theta$ ; so denote it by $f(\theta)$ . Then

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm df}{\mathrm dx}$

By the chain rule,

$\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm df}{\mathrm d\theta}\dfrac{\mathrm d\theta}{\mathrm dx}=\dfrac{\frac{\mathrm df}{\mathrm d\theta}}{\frac{\mathrm dx}{\mathrm d\theta}}$