Ahospital needs to dilute a 50% boric acid solution to make it a 10% boric acid solution. if it needs 25 liters of the 10% solution, how much of the 50% solution, and how much water, should it use?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Alake near the arctic circle is covered by a 222-meter-thick sheet of ice during the cold winter months. when spring arrives, the warm air gradually melts the ice, causing its thickness to decrease at a constant rate. after 333 weeks, the sheet is only 1.251.251, point, 25 meters thick. let s(t)s(t)s, left parenthesis, t, right parenthesis denote the ice sheet's thickness sss (measured in meters) as a function of time ttt (measured in weeks).

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?