Which expression shows the simplified form of (8r to the power of -5) -3

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.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

What is the relationship between all triangles that can be drawn given the same three angles