Determine the quadratic function of the following:

Congruent to y= -1/2x^2;
Parabola Opens up;
Vertex at (-3,2)

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?