What points are solutions for the system of equations?

Which is the graph of the function y=2(4)^x

For what values of x is x2 + 2x = 24 true?

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?