The product of 1.3×10^-4 and a number n results in 2.6×10^12 , what is the value of n?

Every rhombus is a square. true false

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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.