2,916 is going to be your answer, they were all multiplied by 3 hope this helps!
In exercise 3 (2,6) means that x=2 and y=6
so you have to check that if this values of x and y satisfied the given equation,
by showing that the left hand side = the right hand side ..
The answer is 18 beacause 6+6+2+4=18
