PLEASEE HELP ME IM TAKING A TEST AND I DONT GET IT

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.