Suppose a water tank is being pumped out at 3 l/min. the water tank starts at 10 l of clean water. water with toxic substance is flowing into the tank at 2 l/min, with concentration 20t g/l at time t. when the tank is half empty, how many grams of toxic substance are in the tank (assuming perfect mixing)?

Which ratio is equivalent to 10: 85

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?