What's smallest in order, 7.7, 7.77, 7.17, 7.707

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Witch represents the inverse of the function f(x)=1/4x-12

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