In a sequence of numbers, a1 = 8, a2 = 4, a3 = 2, a4 = 1 , and a5 = , what is the common ratio between terms

Quadrilateral wxyz is on a coordinate plane. segment yz is on the line x+y=7 and segment xw is on the line x+y=3. which statement proves how segments yz and xw are related

Could somebody me with this radical simplification?

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0