Starting from 50 feet away your friend skates towards you and then passes you. she skates at a constant speed of 10 feet per seconds at what times is she 70 feet away from you?

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

Use the graph of the sine function y=2sinθ shown below

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 : )