A student obtained 80 out of 100 marks in a paper based on MCQs and true false. He missed the correct options 10 times, out of which he missed four times as many questions on the MCQs as on the true-false. Find the worth of each MCQ if each true-false was the worth of 2 marks.

{0,1,2,3,4,5,6,20,21,22,23,24,25} the distribution is considered to be: skewed the right, skewed the left, not skewed?

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Factor the polynomial expression x6 – x3 – 20