Triangle abc with segment bd where point d is between points c and a, bc equals x, bd equals y, cd equals w, da equals z, and ba equals v what expression represents the value of v? v equals the square root of quantity z times y end quantity v equals the square root of quantity w times z end quantity v equals the square root of quantity w times the sum of w plus z end quantity v equals the square root of quantity z times the sum of w plus z end quantity

Plz i want answer and i would appreciate it is is a b c or d

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?