How do i get polygon wallet address from coinbase

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis

What is the solution for 6 - 7/8? explain the steps.