Answer:
a is correct and b is incorrect
=(a-b)(a^2+ab+b^2)
= a^3+a^2b+ab+ab^2-ba^2-ab^2-b^3
SIMPLIFY
=a^3+ab-b^3
437,875
Step-by-step explanation:
8.25% of 310,000 = 25,575.
25,575 x 5 = 437,875