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3 years ago

Which number is a composite number? A.11 B.21 C.31 D.41

Mathematics

2 answers:

kobusy [5.1K]3 years ago

5 0

Answer:

Step-by-step explanation:

A prime number has only two factors: 1 and itself.

A composite number has more than two factors. The number 1 is neither prime nor composite.

aivan3 [116]3 years ago

5 0

Answer:

B. 21

Step-by-step explanation:

31 is the only number that can be made by multiplying another number other than 1 and itself.

1x21=21

3x7=21

all the other options only have 2 factors

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3 years ago

Rationalize the denominator: GRADE 9 CBSE

kakasveta [241]

Answer:

1. a)

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$\\$

$\begin{gathered} = > \: \: \frac{7}{ \sqrt{12} - \sqrt{5} } \\ \\ = > \: \: \frac{7}{ \sqrt{12} - \sqrt{5} } \times \frac{ \sqrt{12} + \sqrt{5} }{ \sqrt{12} + \sqrt{5} } \\ \\ = > \: \: \frac{7( \sqrt{12} + \sqrt{5} ) }{ {( \sqrt{12}) }^{2} - {( \sqrt{5}) }^{2} } \\ \\ = > \: \: \frac{7( \sqrt{12} + \sqrt{5}) }{12 - 5} \\ \\ => \: \: \frac{ \cancel{7}( \sqrt{12} + \sqrt{5} ) }{ \cancel{7}} \\ \\ => \: \: \sqrt{12} + \sqrt{5} \end{gathered}$

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2 years ago