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Svetach [21]
3 years ago
13

11. Angle C and Angle D are supplementary angles.

Mathematics
1 answer:
Luda [366]3 years ago
4 0

Answer:

HiStep-by-step explanation:

J

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The sum of three numbers is 123. The third number is 4 times the first. The second number is 9 more than the first. What are the
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Step-by-step explanation:

Let the first number = x

Let the second number = x + 9

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Together they make 123

x + x + 9 + 4x = 123              combine the left

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x = 19

=================

First number = 19

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