Question

please help I need full answer no spam if don't know answer than please don't waste your time and my expectations
$give \: me \: mcq \: or \: just \: solve \: the \: full \: equation \: \: no \: incorrect \: answer$
no wrong answer please
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Answer 1

Answer:

use some type of formulas

and you got some idea

Answer 2

Answer:

1=1350

2= option (c) is correct

3=1750

4=400m²

5=105