The value of a piece of office equipment is changing at a rate of -$175 per year. how long will it take for the change in value to be -$1,050?

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 !