3 years ago

X/3 = 5/x-1 cross multiply

Mathematics

1 answer:

defon3 years ago

8 0

15/2x-1
................

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There are 16 books on a shelf. 7 of these books are new. The rest of them are used. What is the ratio of used books to new books

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Answer:

9:7

Step-by-step explanation:

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3 years ago

An unbiased sample is one in which every member of the group has an equal chance of being chosen.

elena-14-01-66 [18.8K]

This is true, because everyone has a fair chance

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3 years ago

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Gravel is being dumped from a conveyor belt at a rate of 30 ft3/min, and its coarseness is such that it forms a pile in the shap

pogonyaev

Answer:

Rate of increase in height = $\frac{dh}{dt}=0.3156ft/min$

Step-by-step explanation:

we know that volume of a cone is given by

$V=\frac{1}{12}\pi d^{2}h$

It is Given that diameter equals height thus we have

$V=\frac{1}{12}\pi h^{2}h\\\\V=\frac{1}{12}\pi h^{3}$

Differentiating both sides with respect to time we get

$\frac{dV}{dt}=\frac{1}{12}\pi \frac{dh^{3}}{dt}\\\\\frac{dV}{dt}=\frac{1}{12}\pi(3h^{2}\frac{dh}{dt})$

Applying values and solving for $\frac{dh}{dt}$ we get

$\frac{dh}{dt}=\frac{12\frac{dV}{dt}}{3\pi h^{2}}\\\\\frac{dh}{dt}=0.3156ft/min$

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3 years ago

A printer makes more than 3 copies of a book every hour. How many books can the printer make in 4 hours?

sineoko [7]

Answer:

Step-by-step explanation:

4 x 3 is 12

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2 years ago

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Suppose you bought D DVD's and B Books. If each DVD cost $14.95 and each book you bought off the 'specials' table cost $6.95, wr

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14.95D + 6.95B

Step-by-step explanation:

Well a simple expression would make D the amount of DVD's you bought and B the amount of Books purchased.

In simple cases the prices don't change depending on that amount so you can multiply them by making it 14.95D and 6.95B.

Making the expression 14.95D + 6.95B.

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2 years ago