Which factors do 25x^2+40x+16 and 25x^2-16 have in common?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Ineed no it anyone can see this

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )