Achild types the letters q, w, e, r, t, y, randomly producing 1000 letters in all. what is the expected number of times that the sequence appears, counting overlaps

Right ∆abc has coordinates a(-7, 3), b( -7, 10), and c(-1, 3). the triangle is reflected over the x - axis and then reflected again over the y - axis to create ∆a'b'c'. which are the coordinates of vertex a'?