Please find the area in the picture

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Which expression is equivalent to sq-80

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.