Which is a stretch of an exponential decay function? f(x)= 4/5(5/4)^x
f(x)=4/5(4/5)^x
f(x)=5/4(4/5)^x
f(x)=5/4(5/4)^x

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?

Elena is paid a constant rate for each hour she works. the table shows the amounts of money that elena earned for various amounts of time that she worked.

Factor the polynomial expression x6 – x3 – 20