Look at the stem-and-leaf plot of scores on a science test. How many students scored more than 70 but less than 80? Giving brainliest to correct answer^^

A. 3

B. 6

C. 4

D. 9

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

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?

Just tell me how to set up the equation.