Please help with this question, my English is not that good:

Here is a truth table for the new symbol *

P * Q T F T T T F F T T F T F

Given this truth-table, what ordinary English expression can this new truth-functional connective (*) be used to symbolize?

One other broad question:

Suppose there are two sentences a and b. On every interpretation that a is true, b is false. What can you conclude (if anything) about the following argument? Briefly explain.

~(a -> b)

.:. ~b v a

-> :material conditional

v :disjuction/or

Many thanks for help