What is the nature of roots of a quadratic equation with a discriminant of -4? a. nonreal
b. real, rational, and equal
c. real, rational, and unequal
d. real, irrational, and unequal

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance