Aclub has 10 members.

if the club is sending 3 members to a convention, how many different groups of 3 members are possible?

Really need on these. i have no idea what to do

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Use circumcenter theorem to solve for the given values