Resolver las siguientes operaciones 9/18 + (-4/18)

6/9 - (-3/4)

(-1/5) - (-3/7)

13/5 - 19/2

(-8/5) + 1/7

(-3 2/5) + (-5/3)

I'm terrible at math any here is appreciated.

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.

Acircle has a circumference of 28.36 units what is the diameter of the circle