What is 1/4 of 16 ………

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Sasha delivers newspapers to subscribers that live within a 4 block radius of her house. sasha's house is located at point (0, -1). points a, b, c, d, and e represent the houses of some of the subscribers to the newspaper. to which houses does sasha deliver newspapers?