The most ancient mathematical texts came from mesopotamia and Egypt. The “inventors” of math are the Greek beginning in around the 6th century BC.
In step one, you are supposed to add 25 to both sides, because if you just subtract, it would be -5x-50=53
Volume is L x W x H
8 x 10 x 3 = 240 cubic units
Yes, felt that. thanks and have a lovely day!:D