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natali 33 [55]
3 years ago
10

The cost of electricity in a certain city is $0.08 for each of the first 300kWh (kilowatt-hours) and $0.13 for each kilowatt-hou

r over 300kWh. Find the number of kilowatt-hours used by a family with a $51.95 electric bill.
Mathematics
2 answers:
Ivahew [28]3 years ago
7 0

Step-by-step explanation:

0.08*300 + 0.13x = 51.95

Multiply thru by 100 to get:

8*300 + 13x = 5195

13x = 5195-2400

13x = 2,795

x = 215 hours

Salsk061 [2.6K]3 years ago
5 0

Answer:

515

Step-by-step explanation:

0.08×300 = 24

24 + 0.13(x-300) = 51.95

0.13(x-300) = 27.95

x-300 = 215

x = 515 kWhours

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The sum of five and three times a number
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5 x 3 = 15 is this correct
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34 in.
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Answer:

Step-by-step explanation:

Lateral surface area of the triangular prism = Perimeter of the triangular base × Height

By applying Pythagoras theorem in ΔABC,

AC² = AB² + BC²

(34)² = (16)² + BC²

BC = \sqrt{1156-256}

     = \sqrt{900}

     = 30 in.

Perimeter of the triangular base = AB + BC + AC

                                                      = 16 + 30 + 34

                                                      = 80 in

Lateral surface area = 80 × 22

                                  = 1760 in²

Total Surface area = Lateral surface area + 2(Surface area of the triangular base)

Surface area of the triangular base = \frac{1}{2}(\text{Base})(\text{Height})

                                                           = \frac{1}{2}(30)(16)

                                                           = 240 in²

Total surface area = 1760 + 2(240)

                               = 1760 + 480

                               = 2240 in²

Volume = Area of the triangular base × Height

             = 240 × 20

             = 4800 in³

6 0
2 years ago
Dr. gavin is conducting a 2 x 4 independent-groups factorial design. how many interactions will dr. gavin need to examine?
Sholpan [36]
For the answer to the question above, I believe the answer is simply <u><em>8.
</em></u>

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I hope this helped you. Have a nice day!
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3 years ago
A zebra ran at a speed of 20 feet per second. Which operation should you use to find the distance the zebra ran in 10 seconds?
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3 years ago
Read 2 more answers
Which fraction can be expressed as a non-terminating decimal? ​
3241004551 [841]

Answer:

\frac{7}{9} = 0.777777 ..

\frac{1}{3} = 0.33333..

Step-by-step explanation:

<u><em>Explanation:-</em></u>

Non -terminating decimals are the one that does have an end term. it has infinite number of terms

Example :-

\frac{7}{9} = 0.777777 ..

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