Which of the following must be true for an expression to be a difference of two squares?
a. all variables are raised to an even power
b. there are only two terms
c. both terms have negative coefficients
A. a and b
B. b and c
C. a and c
D. a, b, and c

"you know, playing tennis is healthier than watching a tennis match on television," katya remarked to her couch potato brother. in this sentence, healthier is a/an a. superlative. b. comparative. c. positive form. d. adverb.

Suppose that an airline uses a seat width of 16.516.5 in. assume men have hip breadths that are normally distributed with a mean of 14.414.4 in. and a standard deviation of 0.90.9 in. complete parts (a) through (c) below. (a) find the probability that if an individual man is randomly selected, his hip breadth will be greater than 16.516.5 in. the probability is nothing. (round to four decimal places as needed.)

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?