14.61 divided by 25 and i just need to now this as soon as you can

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.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?