I am pretty sure that the 117 represents the number of additional texts per month. To understand why I think so just subtract 237-120 you get 117 or 354-237 and so on which would have the same. So, the correct answer is D. The number of the additional texts per month
The slope is referred to as m, insert it and you are done
so y=14x is the solution
We have to choose 3 teachers from a group of 7 teachers, then, the amount of combinations is given by
We have to choose 3 students from a group of 8 students, then, the amount of combinations is given by
Since we have to choose a committee simultaneously formed by 3 teachers and 3 students, we want the intersection of those combinations, which is given by their product
The formula for a combination is given by
Then, we have
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