Evaluate $5(3+8)$ two ways: (a) solve the inside of the parentheses first using the correct order of operations, and (b) distribute the 5 into the parentheses and then solve for the final result. What are the numerical final results for parts (a), and (b)?

Select the correct expansion of -3(a - 4).

Consider the pair of expressions: A = 2(a + b) + 3b and B = 2a + 5b. Are A and B equivalent for all values of a and b? Provide justification.