we have that
the area of the composite figure is equal to the area of a rectangle plus the area of two triangles
so
step 1
Find the area of rectangle
A=(7)(3)
A=21 units2
step 2
Find the area of two triangles
A=2[(1/2)(3)(3)]
A=9 units2
step 3
area total
A=21+9=30 units2
