6x^{2} + 19 + 9x^{2} - 8
With Explanation

I'mnot sure if you're asking for its roots..but here you go :)

Step-by-step explanation:

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

the weight of the object inside the box!