What is the correct answers​

What is the common denominator for 3/5+3/4

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?