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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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The volume of this triangular prism is 140 cubic millimeters. What is the value of d? Please need help!!
Lelechka [254]

Answer:

7 millimeters

Step-by-step explanation:

Volume is the area of the base times it's length.

140/10 is 14

so the area of the triangle is 14

the formula for area of a triangle is base times height divided by 2

so

d x 4/ 2 = 14

multiply both sides by 2

d x 4 = 28

divide both sides by 4

d=7

6 0
3 years ago
Suppose that a family wants to increase the size of the garden which is currently 16 feet long and 8 feet wide without changing
Cloud [144]

Answer:

See below

Step-by-step explanation:

<u>Sides of the garden</u>

  • 16 feet and 8 feet

<u>New dimensions of the garden</u>

  • 16 + 2x and 8 + x

<u>1. The area of the new garden</u>

  • (16 + 2x)(8 + x) =
  • 2x^2 + 32x + 128

<u>2. The difference in area </u>

  • 2x^2 + 32x + 128 - 16*8 =
  • 2x^2 + 32x

<u>3. x= 2 effect on the area</u>

  • 2*2^2 + 32*2 =
  • 8 + 64 =
  • 72 ft²

<u>4. Area difference = 160</u>

  • 2x^2 + 32x = 160
  • x^2 + 16x - 80 = 0
  • Solving we get positive root of 4 ft

<u>5. Area difference = 4 times</u>

  • 2x^2 + 32x = 128*3
  • 2x^2 + 32x - 384 = 0
  • x^2 + 16x - 192= 0
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3 0
3 years ago
Joseph is a college student at The University of Texas. He made good grades in high school and received a scholarship that pays
ki77a [65]

Answer:

  Step-by-step explanation: cap

7 0
3 years ago
Read 2 more answers
Mark is 4 year older than 2 times his sister Helena's Age. Let h represent Helena's age and m represent Mark's age. Write an equ
andreyandreev [35.5K]
<span>2h + 4 = m (twice the value of Helena's age plus 4 will equal Mark's age) 3j - 6 = g (three time John's age minus 6 will equal Glenn's age) 3.35s + .80b = 11.75</span>
7 0
3 years ago
Please help<br><br> Right triangles and trigonometry quiz two on Khan Academy
Sedbober [7]

Answer:

AC = 2.44

Step-by-step explanation:

Reference angle = 26°

Opposite side = AC = ?

Adjacent side = BC = 5

Applying TOA, we have:

Tan 26 = opp/adj

Tan 26 = AC/5

multiply both sides by 5

Tan 26 × 5 = AC

AC = 2.44 (nearest hundredth)

8 0
3 years ago
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