What is the total number of digits required in numbering the pages in a book which has 1,724 pages? I NEED THIS ANSWER ASAP PLZ

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.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6