SOMEONE PLEASE HELP WILL GIVE 25 POINTS

Which multiplicative property is being illustrated below? (type commutative, associative, or identity) 5 × 2 × 4 = 2 × 5 × 4

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).