Can someone do these for me i really need every one else knows how to do it but me but if you do you so much!

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

Is the power produced directly proportional to the wind speed, give reasons for your answer?

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|