Answer:
Problem 1: 
Problem 2: 
Problem 3: 
Step-by-step explanation:
Problem 1:
So we are going to use the following to help us:



So if we make those substitution into the first equation we get:



Factor the
out:

The following is a Pythagorean Identity:
.
We will apply this identity now:

This implies:

We don't need both because both of include points with radius 4.
Problem 2:



Factoring out
from first two terms:

Apply the Pythagorean Identity I mentioned above from problem 1:


or if we factor out r:


r=0 is actually included in the other equation since when theta=0, r=0.
Problem 3:


Isolate the variable by dividing each side by factors that don't contain the variable.
Answer: F = C/59 + 32
Answer:
x- intercept = 6 or (6, 0 )
Step-by-step explanation:
to find the x-intercept, that is where the graph crosses the x-axis, let y = 0 in the equation and solve for x
y = 0 : 2x - 0 = 12 ⇒ 2x = 12 ⇒ x = 6 ← x- intercept