Determine whether the underlined value is a parameter or a statistic. mark retired from competitive athletics last year. in his career as a sprinter he had competed in the 100-meters event a total of 328 times. his average time for these 328 races was modifying 18 seconds with underline18 seconds

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.