No, its not. In a function, each x value has only one corresponding y value. In this relation, the x value 3 has corresponding values of both -1 and 5, which means it cant be a function.
I believe the answer is: Lifting
There are several things that must be followed to adhere to a safe lifting technique. The first one is to make sure that you have a proper grip on the object that you lift. The second one is to not bend or twist the waist during the lifting motion, your back and waist should always be straight. The last one is to keep your legs shoulders-width apart.
All of the above is your answer
The correct answer is tab.
