7. a linear transformation t : r3 ? r2 first performs a horizontal shear that transform e2 into e2-2e1 (leaving ei unchanged) and then reflects points through the line x2 =-n. find the standard matrix of t.

Im literally having a mental breakdown

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.

Proportions in triangles solve for x