Why do we call real solutions zeros?

Let's start by defining these terms. The roots of a polynomial are values of the variable that make the polynomial equal to zero. The solutions of an equation are values of the variable that make the equation true. ... The zeros of a function are the values of the input to the function that make the output equal to zero.

Step-by-step explanation:

Basically because they cross or touch the X axis which would be 0 on the x side. this means (0,1)... (0,8) etc

We can look at 2 similar triangles.
1st triangle has legs: a vertical pole and its shadow, and
2nd triangle has legs legs : a child and his(her) shadow.

We can write a proportion:
height of a pole/height of a child= shadow of a pole/shadow of a child

8/4 = 5/shadow of a child
shadow of a child=(5*4)/8=5/2 ft
5/2 ft