ABCD is a rectangle and the radius of the quarter-circle shown in the figure is 13.3 m. Find the area of the shaded region. (All the dimensions are in m. Assume π =

Cong plants a rose on his 10^{th} birthday. If the plant has one rose to start with, and number of roses doubles every week, then how many roses will be there after x weeks?

It is Duy's birthday today and he distributed toffees to his classmates. The toffees were in a bag as shown below. Duy's puts his hand in the bag and takes out a toffee without looking. What is the probability that he picked out a striped toffee?