Answer:
PR=8
ST=5
Step-by-step explanation:
2x=8
x=4
PR=2x=8
5z=2z+3
3z=3
z=1
ST=5z=5
<u>ANSWER</u>

<u>EXPLANATION</u>
The Cartesian equation is

We substitute


and

This implies that

Let us evaluate the exponents to get:

Factor the RHS to get:

Divide through by r²

Apply the double angle identity

The polar equation then becomes:

3a^3 is the answer
Hope that helps
Plug in the -1 inside the given equation:
y=2x²-5x+9-78-38-18-1
y=2(-1)²-5(-1)-126= -119
I think its four
because 5x1=5
5x2=10
5x3=15
5x4=20