One non-negative number is the reciprocal of another number. The sum of the two numbers is a minimum. What are the two numbers? A. 0 and 0
B. 1 and 1
C. -1 and -1
D. 2 and 1/2
E. -2 and -1/2

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 expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

(x-5)1/2+5=2 what is a possible solution?