Find the area of the regular decagon if the apothem is 2.8 ft. and a side is 1.8 ft. round to the nearest whole number. 5 ft2 25 ft2 13 ft2 18 ft2

We know that
Area of a regular polygon = (1/2)*apothem*perimeter
perimeter of the regular decagon=10*a
where
a is the length  side of the decagon
in this problem
a=1.8 ft
so
perimeter of the regular decagon=10*1.8> 18 ft

Area of a regular decagon = (1/2)*2.8*18> 25.2 ft²
Round to the nearest whole number> 25 ft²

the answer is
25 ft²

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats