Answer:

Step-by-step explanation:
We want to prove algebraically that:

is a parabola.
We use the relations

and

Before we substitute, let us rewrite the equation to get:

Or

Expand :

We now substitute to get:

This means that:

Square:

Expand:




This is a parabola (0,2.5) and turns upside down.
Answer:
b)-3
c)17
d)-11
Step-by-step explanation:
4,-7)
-3
20
20 = 1 x 20
100 = 5 x 20
Since the spinner has 5 slots it contains 3 odd and 2 evens,
this can be expressed as
, cross multiply and we get

%