Which best explains why the given lines are or are not perpendicular x=-2,y=8

Josephine has a great garden with and area of 2x2 + x - 6 square feet

Can you me find the missing length. i attached an image.

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?