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SSSSS [86.1K]
3 years ago
11

Company charges 10 cent per kilowatt an hour of electricity. How much does it cost to operate a chandelier with five 75 watt lig

ht bulbs for 90 minutes?
Mathematics
1 answer:
UNO [17]3 years ago
5 0

Answer:

  5.625¢

Step-by-step explanation:

The amount of energy used by the chandelier is ...

  5 × 0.075 kW × 1.5 h = 0.5625 kWh

At 10¢ per kWh, the cost will be ...

  0.5625 kWh × 10¢/kWh = 5.625¢ . . . . cost of operation for 90 minutes

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Three rats in a lab are injected a type of medicine. The independent probabilities for each rat exhibiting side effects are 0.5,
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Step-by-step explanation:

There are four possible values of X: 0 rats show side effects, 1 rat shows side effects, 2 rats show side effects, or all 3 rats show side effects.

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Probability X = 1:

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P = 0.44

Probability X = 2:

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P = 0.29

Probability X = 3:

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7 0
3 years ago
What is the quotient of the complex number 4-3i divided by its conjugate?
bazaltina [42]

9514 1404 393

Answer:

  0.28 -0.95i

Step-by-step explanation:

Multiply numerator and denominator by the conjugate of the denominator.

  \dfrac{4-3i}{4+3i}=\dfrac{(4-3i)(4-3i)}{(4+3i)(4-3i)}=\dfrac{7-24i}{25}=\boxed{0.28-0.96i}

_____

<em>Additional comment</em>

If the original number is A∠β, the ratio is 1∠(2β), the square of the unit vector in the same direction as the original.

3 0
2 years ago
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