cryptography

Compute the order of the curve defined by y^2 = x^3 + 7*x + 25 over the finite field with 47 elements
On the curve defined by y^2 + x*y = x^3 + x over GF(2^8) compute the inverse of the point (1,1)
On the curve defined by y^2 + y = x^3 + x^2 + x + 1 over the finite field with 701 elements, find a generator and show its order.
On the curve defined by y^2 = x^3 + 4187*x + 3814 over finite field of size 6421 compute the sum of the points (3711,373) and (4376,2463).
On the elliptic curve defined by y^2 = x^3 + 3361*x + 6370 over finite field of size 8461 compute 1001 times the point (1735, 3464).
On the elliptic curve defined by y^2 = x^3 + 1800*x + 1357 over finite field of size 8191, let P1 = (1794, 1318) and P2 = (3514, 409), compute the sum of 13 times P1 plus 28 times P2.