Ineed with this question: the cost for a certain music plan is $9.99 per year plus $0.25 per song you download. if you paid $113.74 one year find the number of songs you downloaded.

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

Need on this one asap im almost done with this subject

Evaluate 3(a + b + c)squared for a = 2, b = 3, and c = 4. a. 54 b. 243 c.729 add solution .