Question

Evaluate 15r+6 (60-r)for r =20,30 and 40. what conclusion can you draw

Answer 1

15 (20)+6(60-20)= 240

15 (30)+6(60-30)=630

15(40)+6(60-40)=720

you can conclude that none of the numbers have anything in common except that they all end in a 0