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salantis [7]
3 years ago
11

Find mZYCD

Mathematics
1 answer:
yulyashka [42]3 years ago
4 0

Answer:

B)140

Step-by-step explanation:

So a line is=180 and the interior angles of a triangle= 180, so I did some manipulations

1. 100 + (5x+5) + <ECD = 180. But we also know that (21x-7) + <ECD=180. With some manipulation we can find that <ECD= 180 - (21x-7), so we can plug that into the other equation

2. Now: 100 + (5x+5) + (180- (21x-7))= 180

3. Solve:

105+5x+180-21x+7=180

112-16x=0

112=16x

x=7

4. Plug x=7 into 21x-7= 140

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Answer:

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Step-by-step explanation:

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3 0
3 years ago
At 10:57 A.M. A submarine was at a depth of feet. Its depth then changed at a rate of -8 feet per minute. What was its depth at
Tatiana [17]

Answer:

<h3>48 feet</h3>

Step-by-step explanation:

First we need to get the total minutes used by the submarine from  10:57 A.M to  11:03 A.M. The total minutes used within the specified period of time is 6 minutes.

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4 0
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erastova [34]
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