An angel is formed by A: Parallel lines B: any ray and any line C: Two rays that shares the same end point D: any two rays plz help me

What is the vertex form of f(x) = x2 + 6x + 3

Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?

This is so hard and it’s for a test