Answer:
6x=100+80
6x=180
x=180÷6
x=30
so we have to work for 30 hours to can buy the CD player and still have $ 80.
<span>A polygon is any 2-dimensional shape formed with straight lines. Triangles, quadrilaterals, pentagons, and hexagons are all examples of polygons.</span><span> A triangle has three sides, and a quadrilateral has four sides.
-https://www.google.com.tw/search?q=Which+figures+are+polygons%3F&ie=utf-8&oe=utf-8&client=firefox-b-...
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The rate at which the gas powered pump deliver water is 160.9 litres per seconds
<h3>How to convert rate?</h3>
The gas powered water pump delivers 42.50 gallons of water per minute.
Therefore,
1 gallon = 3.78541 litres
42.50 gallons = ?
cross multiply
volume = 42.50 × 3.78541 = 160.879925 litres
Hence,
60 seconds = 1 minutes
1 second = ?
time = 1 / 60 = 0.01666666666 seconds
Hence,
rate = 160.9 litres per second
learn more on rate here: brainly.com/question/20561529
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Answer:
Step-by-step explanation:
Arithmetic sequence
First term a = 13
Common difference = 2nd term - first term
= 22 - 13
d = 9
= 13 + 54
= 67
Sum of 7 terms = 
= 
=
= 
= 7 *40
= 280
