PLEASE HELP : (3.8 x 10^8)(6.9 x 10^5) in Scientific Notation

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

Ok a point t on a segment with endpoints d(1, 4) and f(7, 1) partitions the segment in a 2: 1 ratio. find t. you must show all work to receive credit.

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.