Which of the terms cannot be combined with the others?

x
3 xy
-5 x
2 x

3xy

Step-by-step explanation:

You can only combine the like terms, i.e terms with the same variable)

xy is a product of 2 variables, unlike other terms listed (only in x)

38.6°

step-by-step explanation:

resultant is 10 pound

smaller force = 8 pound

angle formed = tan⁻¹(

                        =tan⁻¹(

                          =tan⁻¹(0.8)

                        =38.6°