During a one hour- episode of numb3rs, the entertainment portion lasted 15 minutes longer than 4 times the advertising portion. if a represents the time spent on advertising, write an equation to represent the situation.

An astronaut drops a rock into a crater on the moon. the distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)0.82. what is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

One positive number is 9 more than twice another. if their product is 95, find the numbers

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.