B. 27.5%
because it says ‘all students,’ you look at the total, which is 55/200
and then you need to half that to get it out of 100, so 55/2=27.5
The sum total of the angles in a triangle is equal to 180° degrees.
Well, the y axis is the one that goes up and down, so it's pretty clear that it's flipped over that. After it gets reflected over the y axis, the -2 changes into 2 (so -2 is multiplied by -1) as it is the x coordinate, making the center (2,5). After that, you'd want to get the y value down by 4 to match it up with (2,1), meaning that the second option down is right!
7(3-x)+1 .. first you're going to distribute
21-7x+1 .. then combine like terms
22-7x .. subtract 22 from both sides to get the variable X alone.
-7x=-22
x=3.14
