If c(x) = 4x - 2 and d(x) = x + 5x what is (c×d)(x)?​

If i could just have the statements, i'd be able to

Volume is length times width times height so
20 times 8 times 30 which is 4,800
surface area is ph (p is perimeter of base), h is height.
so perimeter would be length+length+width+width so 20+20+8+8 which is 56. so multiply 56 times 30 which is 1680. hope this !