Why does the multiplicative inverse of a number have the same sign as the number?

A) Multiplicative inverses do not have the same sign.

B) Multiplicative inverses must multiply to equal 0, so they need the same sign.

C) Multiplicative inverses must multiply to equal 1, so they need the same sign.

D) Multiplicative inverses must multiply to equal -1, so they need the same sign.

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

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?

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y