What is 36/40 as a percentage and can you show me how to work it out as well x

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

Avideo game enthusiast saved $750 to spend on a video game player and games. the player costs $400. the games costs $49 each. at most how many games can this enthusiast buy along the player

What is the quotient of 3x^4+22x^3+37x^2-7x+10