Work out (3*10 to the power of 5) * (2*10 to the power of 4) give the answer in standard form

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?

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Weak battery is considered to be a part of routine a. inspection b. wear and tear c. maintenance d. check