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3 years ago

Help pls what's the common difference

Mathematics

1 answer:

horsena [70]3 years ago

7 0

Answer:

#9: 5

#10: -2

#11: -1.5

Step-by-step explanation:

#9: 3,8,13,18,23,(28),(33),(38),.. Go up by 5 each time, so the common difference is 5.

#10: 11,9,7,5,3,(1),(-1),(-3),... Go down (-) by 2 each time, so the common difference is -2.

#11: 3, 1.5, 0, -1.5, -3, (-4.5), (-6), (-7.5),... Go down (-) by 1.5 each time, so the common difference is -1.5.

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Answer:

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Step-by-step explanation:

x+y = 16

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1 chair = $50

y chairs = $50y

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x chairs = $150x

so, 150x+50y = 1800

we got two equations :

x+ y = 16

150x+50y = 1800

Using. substitution method,

x+y = 16

so, x = 16-y

Now

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or, 150(16-y) + 50y = 1800

or, 2400-150y+50y = 1800

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or, 600=100y

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