I need help plz

What is the square root of 45? (step by step working plz)

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.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?