Question

The area of a rectangle whose dimensions are 4x and
3y is
(1) 4x + 3y
(2) 12xy

(3) 3x × 4y
(4) 8x + 6y

Answer 1

Area of rectangle = L * B
                         = 4x * 3y
                         = 12xy

Hence option 2 is correct. 

Answer 2

it is 12xy. because area of a rectangle is lb so 4x(3y) = 12xy.