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Naya [18.7K]
2 years ago
10

21r-7-r+5=-52 solve for r

Mathematics
2 answers:
vredina [299]2 years ago
4 0
উত্তর: আর = - 2.5 আর = -2} ধাপে ধাপে ব্যাখ্যা: 21 র - 7-আর + 5 = - 52 20r - 2 = - 52 20r - 2 + 2 = - 52 + 2 20r = - 50 20r + 20 = - 50 ÷ 20 আর = - 2.5
malfutka [58]2 years ago
3 0

Answer:

r = - 2.5

r=-2\frac{1}{2}

Step-by-step explanation:

21r - 7 - r + 5 = - 52

20r - 2 = - 52

20r - 2 + 2 = - 52 + 2

20r = - 50

20r ÷ 20 = - 50 ÷ 20

r = - 2.5

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The length of side DE is 3cm

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Since the line AC is equivalent to DE, hence AC = DE

To get the length of DE, we will need to get the length oF AC using the Pythagoras theorem:

Given the following parameters

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Required

Adjacent side

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2 years ago
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Answer:

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A

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