Answer:
115.900
Step-by-step explanation:
Since 115.9 is rounded to a tenth, it is already rounded to the nearest thousandth. Rounded to the nearest thousandth, it becomes 115.900.
➡(5x-2)(5x+2)=12
➡5x^2-(2)^2=12
➡25x^2-4=12[/tex]
➡25x^2=12+4=16