What 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

D

Step-by-step explanation:

y-axis reflection transform from (h,k) to (-h,k)

x-axis reflection transform from (h,k) to (h,-k)

Sequence y-axis, x-axis, y-axis, x-axis reflections gives

(h,k) -> (-h,k) -> (-h,-k) -> (h,-k) -> (h,k)

Notice that this result is valid for any figure

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0