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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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2 years ago
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Coefficient

Step-by-step explanation:

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2 years ago
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3 years ago
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-Dominant- [34]

Answer:

  7 square units

Step-by-step explanation:

As with many geometry problems, there are several ways you can work this.

Label the lower left  and lower right vertices of the rectangle points W and E, respectively. You can subtract the areas of triangles WSR and EQR from the area of trapezoid WSQE to find the area of triangle QRS.

The applicable formulas are ...

  area of a trapezoid: A = (1/2)(b1 +b2)h

  area of a triangle: A = (1/2)bh

So, our areas are ...

  AQRS = AWSQE - AWSR - AEQR

  = (1/2)(WS +EQ)WE -(1/2)(WS)(WR) -(1/2)(EQ)(ER)

Factoring out 1/2, we have ...

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d

Step-by-step explanation:

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