what is the area of a parallelogram with the base 15 cm and the height 6 cm?

Question

also:

the area of a trapezoid with the height 12 cm and bases 14.5 cm and 5.5 cm---

and---

this is refering to a parallelogram:

if the area is 360 km squared and the base is 15 km, then what is the height?

Answer 1

90
120
24

Answer 2

A = bh
A = 15(6)
A = 90cm^2

A = .5h(b1 + b2)
A = .5*12(14.5+5.5)
A = 6(20)
A = 120 cm^2

A= bh
360 = 15h
h= 24km