I am not irrational, I am an integer, I am a natural number, and I am a prime number. What number am I?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane