Solve the addition equation by finding a common multiple. HELP! one half plus two thirds plus four sixths equals blank

A)eleven sixths

B)seven elevenths

C)seven sixths

D)nine sixths

Factor this polynomial completely x^2-64

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Identify the expression equivalent to 4(x + x + 7) − 2x + 8 − 4 by substituting x = 1 and x = 2.