To find the measures of the angles of a triangle with one angle measuring 130 and the other two measuring X

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

1. if events a and b are non-overlapping events, how do you find the probability that one or the other occurs? 2. what does it mean if p(a or b) equals 1?