Can anybody help with these please?!

Solve this problem by writing an equation. The length of a rectanglar room is 6.2m and the width is 3.3m. What is its area?

Express this problem as an equation. The length of a rectangular car park is a 128m and the width is 63m. What is its area?

Write the rule for finding the area of a rectangle as an equation which will be true for all rectangles.

Express this problem as an equation. The radius of a circle is 6.3m. What is its diameter? Thanks