Multiply (x -7) (x - 3)

Through non-collinear points there is exactly one plane.

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i