Can you please-solve these problems and explain your process

9. a. Determine the areas (in square units) of the 4 lightly shaded triangles in Figure 12.54. The grid lines are 1 unit apart. Explain your reasoning. b. Use the moving and additivety principles and your results from part (a) to determine the area of the dark shaded quadrilateral in Figure 12.54. Explain your reasoning. FIGURE 12.54 ) Four triangles and a quadrilateral forming a rectangle 10. Determine the area (in square units) of the quadrilateral in Figure 12.55 in two different ways. The grid lines are 1 unit apart. Explain your reasoning. FIGURE 12.55 Determine the area of the quadrilateral