What word is used if there are no visible clouds in the sky?

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

In which form is the following function written? y = - 2(x – 3)(x + 5)