Question

please solve this question 3 and 4​

Answer 1

Answer:

3) 15/30

4). ..........

Answer 2

Answer:

3=> 73/63

4=> 252

Step-by-step explanation:

3.) ==>

$\frac{7}{9} + \frac{8}{21 }$

=> 49+24/63

=> 73/63

hence the valu of

$\frac{7}{9 } + \frac{8}{21} \\ \\ = > \frac{73}{63}$

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4.) ==>

Given :-

$d = \frac{1}{2} n(n - 3) \\ \:$

To find :-

$value \: of \: D \: when \: we \: put \: n \: = 24$

Solution :-

$D = \: \frac{1}{2}n \: (n - 3) \\ putting \: the \: value \: of \: x \: = 24 \\ therefore \: \\ \: D = \: \frac{1}{2} \times 24(24 - 3 )\\ = > D = \frac{24}{2} \times 21 \\ = > D = 12 \times 21 \\ = > D = 252 \\ \: hence \: the \: valuef \: D \: when \: we \: put \: x = 24 \:is \: 252$