Plz plz god bless u and your grades

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice