Answer: 15x +10
Each month she will write 15 page, so our start of the equation is 15x. X stands for the number of months that Monique write, which the question states is any number of months. Since we don't know the number of months we mark that as X. Monique has already written 10 page. That means we must add that to the back of the equation, since it was already done.
Our final equation should be 15x +10
I hope this helped & Good Luck <3 !!