I know it's a lot of problems, but I don't have many points. I am not great with theorems, so if someone could explain 1, 2, 3, and 4 that would be great.

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual