How does a reflection affect the properties of a shape under a reflection ?

Under a point reflection, figures do not change size or shape. ... When you reflect a point in the origin, both the x-coordinate and the y-coordinate are negated (their signs are changed). In a point reflection in the origin, the image of the point (x,y) is the point (-x,-y).

Hope this helps

Step-by-step explanation:

27 +27 or 27times 2=54

the diffrence is 0

you are playing an adventure game on your computer. you come across a troll who won't let you pass and there is no other way to get to the other side of the river except over the bridge he is guarding.

the troll is a nerd. he takes great delight in watching people struggle with his problems. very few get them. he only gives you one chance and then he changes the puzzle. you have to solve this one.

before you are four blocks. they are numbered 11,6, -7,21.

he tells that the answer he wants is minus and between -1 and - 2. you can use +, -, ×, ÷   ( and ) as many times as you like or no times at all. you don't like the way he's looking at you, but you need to cross the bridge. what do you do?