Factor to find the zeros of the function defined by the quadratic expression. 7x2 + 14x - 105

A. x=5 or x=3

B. x = 5 or x = -3

C. x = -5 or x = 3

D)x = -5 or x = -3

***when i answered B it said it was incorrect**

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?