35a²-(x-y)²
please help me by saying the correct answer​

This is the factoring answer! Hope it helps.

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other. 

Exactly what he said he smart