Statins are used to keep cholesterol in check and are a top-selling drug in the u. s. the equation: s − 1.9 x = 5.7 gives the amount of sales ( s ) of statin in billions of dollars x years after 1998. according to this equation, how much will/did people in the u. s. spend on statins in the year 2011?

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.