Can someone help me plz :/

Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

The number at the end of an isotope’s name is the number.