12⋅5.16+10.064= this is for tonights homework

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

I’m really confused and need your assist me with this question i’ve never been taught

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30