Hello, i'm assuming you just need a word answer (and you peeked to know the answer).
Well, first tackle Roberto. We know he is not doing calculus, nor physics since it is on a different due date. Therefore we know it is english the poor guy needs to write.
Meredith's assignment is clearly in the middle, so Roberto's is the last day, Friday.
We also know Meredith isn't doing physics either so it must be Jonathan's paper, which is the first day, Tuesday.
So what is left is calculus for Meredith, on Wednesday.