Which function is equivalent to
f(x)=-4(x+7)2-6

What is the value of y? round to the nearest tenth

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

This is different from the first one can someone me