Does anyone know how to answer this question? it's number four on limits.

The limit from the left is equal to the value of the function:
.. f(0) = 0

The limit from the right is the value that x^2 approaches as x approaches 0. That is 0^2 = 0.

Left and right limits are the same, so the limit as x approaches zero is 0.

Answer: r=4.5  feetexplanation: radius  r  is half of the diameter  d,⇒r=d2=92=4.5  feetidk i could be wrong