I NEED HELP PLEASE, THANKS! :)

What signals you that factoring by grouping is the best method to use when factoring a problem?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.