In chemistry class, the ratio of passing grades to failing grades is 7 to 5. how many of the 36 students failed the chemistry class?

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

Translate this phrase into an algebraic expression. 21 more than twice goran's savings use the variable g to represent goran's savings. need to know fast.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?