There are 10 members on a board of directors. if they must form a subcommittee of 3 members, how many different subcommittees are possible

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!