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erica [24]
3 years ago
12

In 1980, wind turbines in Europe generated about 5 gigawatt-hours of energy. Over the next 15 years, the amount of energy increa

sed about 59% (each year). How many gigawatt-hours were generated?
Mathematics
1 answer:
Zinaida [17]3 years ago
3 0
Well the equation could be, f(x)=5(1.59)^15
which would equal 5247
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You have to pay to fix the sink. They are charging you $75 for parts and
Alika [10]

Answer: y = 20x+75

Step-by-step explanation:

Hi, to answer this question we have to write an equation:

The cost (y) must be equal to the product of the cost per hour of installation (20) and the number of hours that it takes (x); plus the fixed cost of parts and installation (75).

Mathematically speaking:

y = 20x+75

Feel free to ask for more if needed or if you did not understand something  

4 0
3 years ago
Which is the value of 3b2−b3b2-b when b = 5?
kow [346]
What's the equation exactly?

8 0
3 years ago
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43x+ 67y = -24 and 67x + 43y = 24 solve
aleksandrvk [35]

Answer:

  (x, y) = (1, -1)

Step-by-step explanation:

We'll write these equations in general form, then solve using the cross-multiplication method.

  43x +67y +24 = 0

  67x +43y -24 = 0

∆1 = (43)(43) -(67)(67) = -2640

∆2 = (67)(-24) -(43)(24) = -2640

∆3 = (24)(67) -(-24)(43) = 2640

These go into the relations ...

  1/∆1 = x/∆2 = y/∆3

  x = ∆2/∆1 = -2640/-2640 = 1

  y = ∆3/∆1 = 2640/-2640 = -1

The solution is (x, y) = (1, -1).

_____

<em>Additional comment</em>

The cross multiplication method isn't taught everywhere. The attachment explains a bit about it. Our final relationship changes the order of the fractions to 1, x, y from x, y, 1. That way, we can use the equation coefficients in their original general-form order. (The fourth column in the 2×4 array of coefficients is a repeat of the first column.)

4 0
2 years ago
Plzzz help 100+ points
o-na [289]

Answer:

1) 95% is the minimum

Step-by-step explanation:

If 5 tests were taken, and 100 pts each, and he received 77/100 on all 5 tests, then his grade would be 385/500 being 77%. Add another 100 pts to the denominator (for the last test) and 95 to the numerator, equaling 480/600, or 80%.

4 0
3 years ago
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Write 245,800,000 in scientific notation.
Olenka [21]

Answer:

2.485x10^8

Step-by-step explanation:

3 0
2 years ago
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