Use a permutation expression to solve. In a race of 39 people, how many different ways can the runners place in 1st, 2nd, and 3rd?

9,139

18,278

54,834

59,319

When you answer this can you explain

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

Y+ 2/y is it a polynomial in one variable or not? and if so, why?