What is the value of x, if the perimeter of the rectangle is 42? *

This is the problem :

Name the most appropriate metric unit for each measurement

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?

Which of the following shows the length of the third side, in inches, of the triangle below