Answer :
so assuming you meant to type a=7.5mm and b=10.8 (uppercase and lowercase letters matter) then
pemdas
parethasees
exponents
mulitplication or division
addition or subtraction
area=1/2 times h times (a+b)
area=1/2 times 2 times (7.5 +10.8)
area=1/2 times 2 times (18.3)
area=1 times (18.3)
area=18.3 square mm also written as 18.3 mm^2
area=18.3 square mm or 18.3mm^2
pemdas
parethasees
exponents
mulitplication or division
addition or subtraction
area=1/2 times h times (a+b)
area=1/2 times 2 times (7.5 +10.8)
area=1/2 times 2 times (18.3)
area=1 times (18.3)
area=18.3 square mm also written as 18.3 mm^2
area=18.3 square mm or 18.3mm^2
Area of trapezium=1/2 h(a+b),
a=7.5mm, b=10.8mm, h=2.0mm.
1/2 2(7.5+10.8).
1/2 2(18.3).
1/2 36.6.
Area of trapezium=18.3sqmm