Hi,

Center is (0,0)
Foci are (-3√2,0) and (3√2,0)
2450 is the correct answer because if you multiply 3500 x .70 then you get 2450. Hope this helped
X+9-3≤14
Add 3 to the other side. (do the inverse of subtraction)
x+9≤17
Subtract 9 on both sides. (the inverse of addition)
x≤8
I hope this helps!
~kaikers