I need help with this please ASAP

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual 

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