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brilliants [131]
3 years ago
6

An oak tree is 1.5×1031.5×103 centimeters tall. Which unit of measurement is most appropriate to measure this height?

Mathematics
1 answer:
sdas [7]3 years ago
3 0
If you multiply the amount that you give 1.5 × 1031.5 × 103 the result is 159366.75 centimeters, which is very long to write. For better understanding it is preferable that you write the answer to this multiplication in kilometers. Which would give a result of 1.59 kilometers
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2 years ago
A poster is to have an area of 240 in^2 with 1 inch margins at the bottom and sides and a 2 inch margin at the top. Find the exa
Vsevolod [243]

Answer:

  4√10 inches wide by 6√10 inches tall

Step-by-step explanation:

"Poster area" problems have an interesting general solution. The "printed area" is maximized, or the "poster area" is minimized, when the ratio of poster dimensions is equal to the ratio of margin dimensions.

Here, the top/bottom margins total 3 inches, and the side/side margins total 2 inches. That is, the printed area will be maximized when the poster has a width : height aspect ratio of 2 : 3. If w represents the width, then the total area is ...

  (w)(3/2w) = 240 . . . . square inches

  w^2 = 160

  w = √160 = 4√10 . . . . width in inches

Then the height is ...

  height = (3/2)w = (3/2)(4√10) = 6√10 . . . . height, inches

_____

<em>Graphical solution</em>

A graphing calculator gives the same result for x=width. Poster width is about 12.649 inches (=4√10), and printed area is a maximum of about 170.1 square inches.

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<em>Calculus solution</em>

Let x represent the width of the poster. Then x-2 is the width of the printed area. The height of the poster will be 240/x, and the height of the printed area will be (240/x)-3. We want to maximize the printed area ...

  a = (x -2)(240/x -3)

which means we want to find the value of x where the area derivative is zero.

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  da/dx = 0 = 480/x^2 -3

Solving for x, we get ...

  x^2 = 480/3 = 160

  x = √160 = 4√10 . . . . . poster width, as above

3 0
3 years ago
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