Apyramid has a square base that is 160m on each side what is the perimeter of the base in kilometers

well, the base has four sides of 160 meters each, thus its perimeter is 160+160+160+160, or 640 meters.

well, a KILOmeter has 1000 meters, so

The range is the set of 'y' values that result from the given domain .
Since the absolute value of any real number is a positive, the range is all the real numbers less than or equal to 0.
 
We can see this by placing x = 1 and hence getting 0.
                                               x  = 1  and we get -2