State the number of complex roots, the number of positive real roots and the number of negative real roots of x^4-x^3-6x+3=0

That is right sorry i was gonna answer but i already saw his

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 !