Pls i need stuck on this question

braelyn is writing an equation to represent the perimeter of a rectangle with the width equal to half the length. she knows that the perimeter is equal to 18 units and needs to find the length and width of the rectangle. which equations represent this relationship? check all that apply.

1. x+0.5x1/2x=18
2. 2x+x=18
3. 2x+2(2x)=18
4. x+0.5x+x+0.5x=18
5. 2(x+0.5x)=18
6. 2x+0.5x=18

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Which statement accurately explains whether a reflection over the y-axis and a 270° counterclockwise rotation would map figure acb onto itself? a coordinate plane with figure acb with point a at 1, 1, c at 3, 4 and b at 5, 1 yes, a″c″b″ is located at a″(1, 1), c″(4, 3), and b″(1, 5) yes, a″c″b′ is located at a″(1, 1), c″(3, 4), and b″(5, 1) no, a″c″b″ is located at a″(1, 1), c″(4, 3), and b″(1, 5) no, a″c″b″ is located at a″(1, 1), c″(3, 4), and b″(5, 1)

Is a positive integer raised to a negative power always positive