Which points are reflections of each other across the y-axis?

A coordinate plane.

(–7, –3) and (7, –3)
(–5, 4) and (5, –4)
(1, –8) and (1, 8)
(–3, 5) and (5, –3)

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Moira has a canvas that is 8 inches by 10 inches. she wants to paint a line diagonally from the top left corner to the bottom right corner. approximately how long will the diagonal line be?

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field