How much greater is a magnitude 4 earthquakes than a magnitude 3 earthquake?

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

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.

How do you find the circumfrance of a circle?