I have 2/5 m wich = _ cm 1 m equals 100cm how many cm do I have

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

The coordinates r(1, -3), s(3, -1) t(5, -7) form what type of polygon? a right triangle an acute triangle an equilateral triangle an obtuse triangle

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.