Answer:
C≈43.98cm
Step-by-step explanation:
C=2πr
d=2r
C=πd=π·14≈43.9823cm
Solving the inequality
the value of q is 
Step-by-step explanation:
We need to solve the inequality:
and find value of q
Solving:

So, solving the inequality
the value of q is 
Keywords: Solving inequality
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Refer to the diagram shown below. It shows a vertical cross-section of the paraboloid through its axis of symmetry.
Let the vertex of the parabola be at the origin. Then its equation is of the form
y = bx²
Because the parabola passes through (18,8), therefore
8 = b(18²)
b = 0.02469
The parabola is y = 0.02469x².
The receiver should be placed at the focal point of the paraboloid for optimal reception.
The y-coordinate of the focus is
a = 1/(4b) = 1/0.098765 = 10.125 in
Answer: The receiver is located at 10.125 inches from the vertex.