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Arlecino [84]
3 years ago
5

Define a variable and write an inequality to model each situation. A light bulb can be no more than 75 watts to be safely used i

n this light fixture.
Mathematics
1 answer:
DaniilM [7]3 years ago
3 0
Let the number of watts =w ‘no more than’ means less than or equal to, thus we will use that sign. The inequality can be written as: w<75
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W varies jointly as X and Y and inversely as the square of Z. If W=280 when X=30, Y=12, and Z=3, find W when X=20, Y=10, and Z=2
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The answer is 350.

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The joint variation of W with x, y and z may be expressed as follow,                                    W = kxy / z²where k is the constant of variation. Substituting the first set of values for the variables,                                   280 = k(30)(12) / 3²The value of k from the equation is 7. Substituting to the same equation the values of the next set of variables,                                      w = (7)(20)(10) / 2² = 350

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