Which of these expressions are equivalent to -42x + 84? *choose two correct answers*

A. -3(-14x - 28)
B. 3(-14x + 28)
C. -14(3x - 6)
D. -14 (- 3x - 6)

Barbara's piano instructors house is 7 1/8 miles from her house. after biking for 1 3/4 miles she stops to rest how much longer does she need to bike to reach her instructor's house

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

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