I think your answer is qt
Answer: t^2 = 36 or 1
Step-by-step explanation: Divide everything by -5, and get t^2 -6t -5=0, Factoring is (t-6)(t+1), so t=6 or t=-1. Both squared are 36 and 1 so either of these could be the answer. Hope this helps!
X×2=10
X=10÷2
X=5
Proof: 5×2=10
The first equation is

The second equation is

If you sum the two equations you'll cancel y:

And since the sum must be 11, we have y=9.
275 divided by 5 is 55. 55 is your answer