Answer:
5x-15
Step-by-step explanation:
Product means multiply, so that would just make it 5x. Less than means subtract. So its 5x-15.
N is 7 x 7, because there is a order which is the term and number are like being multiplied by the same number for example "1 x 1 =1, 2 x 2 = 4" and so on
