Asprinter runs 400 meters in 54 seconds what is the runner's average. running rate in meters per second

Which answer is the solution set to the inequality |x|< 9? a. x< -9 or x> 9 b. x> -9 and x< 9 c. x> -9 or x< 9 d. x< 9 and x< 9

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !