Find the slope of the line tangent to 3sin(x)+xsin(y)=0 at (pi, pi)

Ineed with number 17 i don’t get it at alll

The vertices of a rectangle are given in the columns of the matrix . if is found to perform a transformation, what are the coordinates of the transformed rectangle? (0, 0), (0, –3), (–3, –3), (–3, 0) (0, 0), (0, 3), (3, 3), (3, 0) (0, 0), (0, 3), (–3, –3), (–3, 0) (0, 0), (0, 3), (–3, 3), (–3, 0)

Find the required measurements of the following trapezoids. a = 8 cm b = 16 cm h = 10 cm