Using the distributive property to remove the parentheses -2(-3x^2-3+6v^3)

When finding best estimates, it is best to round each number based on how many digits the number holds. In this case, the dominant place of 289 is the hundreds place, which means this should be rounded to 300. The dominant place of 7 is 10. Therefore, you multiply these two numbers in order to get your best estimate, which is 3000 (overestimate).