Robert can swim the first 50 meters of a race in 1 minute. then he slows down by 12 seconds for each of the next 50 meters of a race. how long will it take robert to swim a 400 meter race?

Write the expression in simplified radical form. show all steps and work including any foil method work. (hint: use the conjugate. no decimal answers.) (9-2√3)/(12+√3)

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics