Explanation:
Area of a rectangle = length x width
Perimeter of a rectangle = 2 x (length + width)
Width = 3ab^4
Length = 5a^2b^4
Area = length x width
Area = (5a^2b^4) x (3ab^4)
Area = 15a^3b^8
Therefore, the area of the rectangle is 15a^3b^8.
Perimeter = 2 x (length + width)
Perimeter = 2 x (5a^2b^4 + 3ab^4)
Perimeter = 2 x a^2b^4 (5 + 3)
Perimeter = 16a^2b^4
Therefore, the perimeter of the rectangle is 16a^2b^4.