5p squared + 12q squared

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.