1.The sample is biased because it does not represent the population.
2.The question is biased toward a Yes response.
No it's smaller. 12.56 is much less than 125.6.
Consider posting each question separately, please.
Given <span>-2.8k-4.31=-15.79 :
1) Isolate the "k" term on the left by adding 4.31 to both sides of this equation.
2) Simplify the right side.
3) Divide both sides by -2.8 and you'll have the answer: k = ?</span>