For problems 1 – 6, graph each function. label the vertex and axis of symmetry.

1. y=x^2-2x-1

2. y-3=(x+2)^2

3. y=(x+3)(x-4)

4. y=2x^2-12x-19

5. y-9=-5(x-2)^2

6. y=-3x(x-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?