Louis needs to make an investment that will double in 5 years. which interest rate, compounded annually, is the lowest rate that will allow for this to happen?
a.
4.4%
b.
7.2%
c.
14.4%
d.
16.6%

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.