Solve this pls PLS

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.