Hey can someone help me with 2x + 4 I need help

What is the volume of the sphere shown below with a radius of 3?

Which of the following graphs represents the function f(x) = 2^x

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.