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slava [35]
3 years ago
15

A number, x, decreased by the sum of 2x and 5 Please show work!!!!!! Thank you!!!!

Mathematics
1 answer:
Natali5045456 [20]3 years ago
7 0
Ive got a soulution
the number is 3 times the sum of its digits
45 is added=4+5=9so,a common numbers in 3rd and 9th table
9,18,27,36,45...
27+45=72
2+7=9
or
4+5=9
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<h3>What is meant by the term maxima?</h3>
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For the given question dimensions of open-top box;

The volume is given by the equation;

V = (8.5-2x)(11-2x)(x)

Simplifying the equation;

V = x(4x² - 39x + 93.5)

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dV/dx = 8x² - 39x + 4x² - 39x + 93.5

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Put the Derivative equals zero to get the critical point.

12x² - 72x + 93.5 = 0.

Solve using quadratic formula to get the values.

x = 4.1  and x = 1.9

Put each value of x in the volume to get the maximum volume;

V(4.1) =  4.1(4(4.1)² - 39(4.1) + 93.5)

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