Work out 100-99 98-97 ... 4-3 2-1?

Which set of reflections would carry trapezoid abcd onto itself? a) x-axis, y=x, y-axis, x-axis b) x-axis, y-axis, x-axis c) y=x, x-axis, x-axis d) y-axis, x-axis, y-axis, x-axis

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30

Which of the following will form the composite function?