How do I figure out if it a function or not?

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a seven or king. (b) compute the probability of randomly selecting a seven or king or jack. (c) compute the probability of randomly selecting a queen or spade.

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Write the equation in logarithmic form e^x=403.429