Identify the slope and y-intercept: y = -x + 13 y help mee please​

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

Which graph represents an even function?

Solve for x where 0 equation: cot^2x+2cotx+1=0