Does anyone know the answer?

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

How do i take any fraction and make it into a decimal or percentage?

Thomas is using a drawing program to complete a construction. which construction could he be completing? two perpendicular lines are drawn. inscribing an equilateral triangle in a circle inscribing a square in a circle inscribing a regular pentagon in a circle inscribing a regular hexagon in a circle