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VladimirAG [237]
3 years ago
15

Karen make $5 per hour babysitting and $12 per hour giving music lessons. On the weekend, she worked a total of 18 hours and mad

e $139. How many HOURS did she spend BABYSITTING
Mathematics
1 answer:
Lilit [14]3 years ago
4 0

Answer:

11 hours

Step-by-step explanation:

Let's say Karen makes x hours babysitting and y hours giving music lessons.

Because she worked a total of 18 hours, we know that x + y = 18.

5 * x is how much money she earns babysitting for x hours, while 12 * y is how much money she earns giving music lessons for y hours. Adding them up gives her total revenue:

5x + 12y = 139

We now have a system of equations. Let's multiply both sides of x + y = 18 by 12:

12 * (x + y) = 18 * 12

12x + 12y = 216

Now, subtract 5x + 12y = 139 from 12x + 12y = 216:

     12x + 12y = 216

-     5x + 12y = 139

_________________

       7x + 0y = 77

Divide both sides by 7:

x = 11

Thus, Karen spent 11 hours babysitting.

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What economists consider a "leading indicator" of the health of the economy is: GDP.

<h3>What is GDP?</h3>

GDP which full meaning is gross domestic product can be defined as the value of goods and service produce within a country at a particular period of time.

Gross domestic product is a leading indicator of an economy wealth based on the fact that it help to measure the  wealth of a nation economy.

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4 years ago
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3x + 14 = 20 - 2x. What is x and how to solve it?
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Nora and Amirah work in different companies. Nora has a day off every 4 day while Amirah has day off every 6 days .Nora last day
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