5. If possible, express w as a linear combination of vectors u and v. w = (1,0, –7), u = (1,3,4), v = (3,2,5) %3D Is w in the span vectors u and v?

Please recreate the steps and explain the concepts clearly so I can retrace the steps and get a better grasp on the subject.

To protest the logging of old-growth forests in Northern California, an activist lived in a tree for about a year. Suppose the branch that she was living on was 7 meters above the ground. Assuming the tree grows half a meter a year, how far above the ground would she be if she were still living there in five years? In 20 years? NOTE: THIS IS NOT A 7TH GRADE MATH PROBLEM. THINK.

Please explain how to get to the answer in-depth and also help me master the concept for future problems.