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3 years ago

10

Explain what it means for x and y to vary directly

1 answer:

SVEN [57.7K]3 years ago

5 0

Answer:

(Some textbooks describe direct variation by saying " y varies directly as x ", " y varies proportionally as x ", or " y is directly proportional to x . ") This means that as x increases, y increases and as x decreases, y decreases—and that the ratio between them always stays the same.

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I need the answer for this problem

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Molly read 50 out of the 200 pages in her fiction book. Joel is also reading a fiction book, but his book has 280 pages in total

katrin [286]

Answer:

$x = 70$

Step-by-step explanation:

Given

Molly: 50 out of 200

Joel: x out of 280

Required

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Start by representing the giving parameters as ration

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Joel = x : 280

From the question, the ratios are equivalent. So,

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Convert to fractions

$\frac{50}{200} = \frac{x}{280}$

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3 years ago

A piece of cardboard measuring 9 inches by 11 inches is formed into an open-top box by cutting squares with side length x from e

Alika [10]

Answer: $\left ( 11-2x\right )\times \left ( 9-2x\right )\times \left ( x\right )$

Step-by-step explanation:

Given data

breadth=9 in

Length=11 in

Now a square of side x is cutted for each corner such that the cardboard is made into a open-top box with

length=11-2x

breadth=9-2x

height=x

Here substract 2x because from both sides of length and breadth x units are reduced.

therefore volume of new open-top box is

Volume(v)= $\left ( 11-2x\right )\times \left ( 9-2x\right )\times \left ( x\right )$

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3 years ago