Step-by-step explanation:
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- Length of a park ( l ) = 55 m
- Breadth of a park ( b ) = 35 m
- Width running outside the park ( d ) = 2.5 m
- Rate of paving the path with stones = Rs 120 per sq.metre
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- Area of the park
- Cosy of paving the path with stones at Rs 130 per sq.metre
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Part 1 : 
plug the known values and simplify :
⟹ 
⟹ 
⟹ 
Part 2 : 
⟹ 
⟹

Hope I helped ! ♡
Have a wonderful day /night ツ
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Step-by-step explanation:
5×4=20. 20×9=180
+
9×4=36. 36/9=4
180+4=184
answer=184
when a number is next to a letter it mean to multiply
and / means to divide
Differentiating both sides of

with respect to <em>x</em> yields (using the chain rule)

Solve for d<em>y</em>/d<em>x</em> :

The answer is then D.
D is equivalent because brackets don’t change anything here
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