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3 years ago

13 times what equals 221

Mathematics

2 answers:

denis-greek [22]3 years ago

7 0

Answer: 17

You must divide 221 ÷ 13 and get 17.

To see if 17 is correct multiply 17×13 and get 221.

fomenos3 years ago

3 0

Answer:

Step-by-step explanation:

13 x 17 = 221

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earnstyle [38]

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2 years ago

Complete the steps: 4/9 ÷ 1/2

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2 years ago

What is 8+w/4 when w =16

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Step-by-step explanation:

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3 years ago

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Please help me to prove this.

Vanyuwa [196]

<h3><u>Answer</u> :</h3>

For triangle : A + B + C = π

⇒ A + B = π - C

⇒ cot(A + B) = cot(π - C)

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⇒ $\bf{cotA\:cotB+cotB\:cotC+cotC\:cotA=1}$

<u>Now 1st part of the given expression</u>!

⇒ $\sf\dfrac{cosA}{sinB\:sinC}$

⇒ $\sf\dfrac{cos(\pi-(B+C))}{sinB\:sinC}$

⇒ $\sf\dfrac{-cosB\:cosC+sinB\:sinC}{sinB\:sinC}$

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<u>Similarly 2nd part</u>!

⇒ 1 - cotA cotB

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⇒ 1 - cotC cotA

<u>LHS</u> :

$\circ\:\sf{3-(cotA\:cotB+cotB\:cotC+cotC\:cotA)}$

$\circ\:\sf{3-1}$

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<h3>Hence Proved!!</h3>

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2 years ago

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