Answer:
I'm not quite sure what you are asking but I think the pattern would lead to -3 being your answer.
<span>3<span>5 </span>2<span>2 </span><span><span>45 </span></span><span><span>28 ............</span></span></span>
Coulld you please explain a little more? The number of credits sam needs to get his degree is 26.