70
The information given is that for every 2 students studying physics 3 were studying chemistry
Answer:
Q ' (3,4)
Step-by-step explanation:
When we reflect across the x axis, the y coordinate becomes -y
Q (3,-4) becomes Q' (3,- -4)
Q ' (3,4)
Move all the terms involving the sine to one side, and all the numbers to the other:

A, because: 20x10 1/2=210
And 20x11 1/4=225
And 225-210=15
So thats the answer.
I believe the answer would be inconsistent and dependent, and also inconsistent and independent. System of equations with three variables are either independent, dependent or inconsistent , each case can be established algebraically and represented graphically.