What is the opposite of 67.41..is it a negative or positive?

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

Can someone, me with this.i really need with this

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?