What is the LCM for 12 and 14

Select the best attribute for the angle pair formed by two parallel lines intersected by a transversal.

Ahomeowner plans to hang wallpaper on one wall of a bedroom that is 10 feet long if a stripe of wallpaper is 20 inches wide and stripes or hung vertically how many stripes on wall paper with the homeowner required

What number should be added to both sides of the equation to complete this square? x^2-10x=7