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Pavel [41]
3 years ago
7

An electric company charges a certain rate per kilowatt-hour (\text{kWh})(kWh) of electricity used and an administrative fee of

\$3.50$3.50. The company charged Zhao \$63.25$63.25 for using 800\,\text{kWh}800kWh of electricity. Zhao uses the equation, 63.25=800r+3.5063.25=800r+3.50 to represent the situation. What does the variable rr represent in the equation
Mathematics
2 answers:
zavuch27 [327]3 years ago
3 0

Answer:

r represents the rate the electric company charges per kilowatt-hour.


Step-by-step explanation:

r represents the rate the electric company charges per kilowatt-hour.


Total charged to Zhao was 63.25 out of which 3.50 is administrative charge (fixed).

  • Total charge consists of "administrative charge" + "charge per kilowatt hours*hours used
  • The equation is given as 63.24 = 3.5 + 800r

<u>Matching the "word equation" with "mathematical equation", we see that 800 is the hours used and r is the charge per kilowatt hour.</u>

Nezavi [6.7K]3 years ago
3 0

Answer:

the charge per kilo-watt hour

Step-by-step explanation:

khan academy said so :))))

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Answer:

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Step-by-step explanation:

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3 years ago
Julio bought 4 pencils and 3 erasers for $0.37 and David paid $0.33 for 3 pencils and 4 erasers. What is the cost of one pencil?
grigory [225]

cost of pencil = x = 0.07

and cost of eraser = y = 0.03

Step-by-step explanation:

let cost of pencil = x

and cost of eraser = y

So, we have equations:

4x+3y=0.37\\3x+4y=0.33

Solving both equations to find value of x and y

Let:

4x+3y=0.37\,\,\,eq(1)\\3x+4y=0.33\,\,\,eq(2)

Multiply eq(1) with 4 and eq(2) with 3 and subtract

16x+12y=1.48\\9x+12y=0.99\\-\,\,\,-\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\\--------\\7x=0.49\\x=0.07

Putting value of x in equation 1:

4x+3y=0.37\\4(0.07)+3y=0.37\\0.28+3y=0.37\\3y=0.37-0.28\\3y=0.09\\y=0.03

So, x= 0.07 and  y = 0.03

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Keywords: System of equations

Learn more about system of equations at:

  • brainly.com/question/9045597
  • brainly.com/question/3739260
  • brainly.com/question/13168205

#learnwithBrainly

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Anna35 [415]

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Step-by-step explanation:

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0.8 is the second strongest

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3 years ago
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m_a_m_a [10]

Answer:

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Step-by-step explanation:

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Now you want to try to figure out what the altitude is of the triangle so you divide it in half. Making the bottom side length now 25 because half of 50 is 25. You now have to use Pythagoreans theorem to figure out the altitude:

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now you put that into the expression: x√3:

x√3 = 43.30127019

x = (43.30127019) ÷ (√3)

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