F(x) = 4x2 + 2x + 6 What is the value of the discriminant of f?
How many distinct real number zeros does f have?

How do you solve a question like this?

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?