What is the frequency of the sinusoidal graph?

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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?

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*