How do you find the volume of a cardboard box this is 12 cm long, 2cm wide and 3 cm high?

Is a positive integer raised to a negative power always positive

Yesterday i ran 5 miles. today, i ran 3.7 miles. did my percent increase, decrease or is it a percent error? plz i need

X+y=-4 x-y=2 use elimination with adding and subtraction