Find the cubic polynomial equation with the rootsw -2i and -5

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

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

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?