Answer:
There are 32 pupils in the class
Step-by-step explanation:
Let's say there are N pupils in the class. Then each pupil must send N-1 cards - because it would make no sense to send one to themselves! So each of the N pupils send N-1 cards, which becomes 992 cards in total. In equation form, this is
This is a second degree polynomial, which has the solutions
where
If we insert these numbers in the equation,
If we choose the solution with the minus sign, we get
N=-31
but this makes no sense! There can't be a negative number of pupils in the class!
So we choose the solution with the plus sign,
So there are 32 pupils in the class
The picture show the answer and steps. x equals 5
Answer:
the graph is correct if the lie you are plotting is y=3x+3
Answer:
The answer is "D" - 60 degrees.