14. Suppose you have created a canvas with coordinates (0,0) to (100,100). A mouse click returns window coordinates (25,25). What are the corresponding clip coordinates? Make a sketch. 15. Give the parametric equation for the line l(t) through the two points p and q, so that l(0)=p and l(1)=q. 16. Given points pi,i=1,2,3, is p=0.5p1+0.25p2+0.25p3 a barycentric combination? Why? 17. Sketch and label a triangle with vertices p1,p2,p3. Let p=up1+vp2+wp3. Sketch the point p with barycentric coordinates (1/2,0,1/2). 18. Suppose per vertex colors are passed to the vertex shader. A triangle is sent down the pipeline with vertex colors (1,0,0,1),(0,1,0,1),(0,1,0,1). What is the color of a fragment at the centroid of this triangle