Help meee 50 points explain ALL OF IT if you really do it ill give you 200 points pls

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

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