Hi guys. Please help! I'm stuck. Thanks!

1.Explain the expression xf(x), xf(x).

2.Determine the mean and give the approximate value in a Poisson distribution given that P(6) = P(1).

3.Function Q is defined by f(z)=z/(z+z). What is its domain?

4.A circle of radius 1 has z lying in it and z1. Solve for the locus z/(1-z²).

5.What is the equivalent of *(q,ya)?

6.Give the representation of the extended transition function.

7.Determine the number of primitive roots that are there in Z<19>.

8.Determine the order of the group G= .

9.In elliptic curve cryptography, Q = (-x1, y1) is the inverse of point P =(x1, y1).

10. Solve for the real and imaginary roots that are present in the equation y2=x3-4x.