Which of the following statements is true? a. adjacent angles are always complementary. b. the sum of the measures of complementary angles equals 90°. c. adjacent angles are always equal in measure. d. the sum of the measures of supplementary angles equals 90°.

Which is the completely factored from of xy^3-x^3y

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?