The sum of 1/11 and 1/15 is closest to 0 1 or 2

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?

A.s.a.! this is a similarity in right triangles. next (solve for x)a.) 12b.) 5c.) 12.5d.) [tex] 6\sqrt{3} [/tex]