Could someone be kind enough to help me out?

Find the roots of the equation below. x^2 - 6 + 9 = 0

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

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