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If you're a brilliant elementary student who has just finished all the K-8 work but hasn't learned anything more yet, then you'll need to watch videos for each topic and work on the exercises. Averaging two questions per topic and taking one minute per question, that's 780 minutes and you're done in 13 hours. If you're a fantastic math PhD, then it's just a matter of answering one or two questions for each one (I think Khan gives you more credit towards mastery the faster you answer questions, at least at first). So let's assume we're talking about the remaining 390 exercises, Algebra through Integral Calculus. And since I was able to find a choice, I will not pick "None of the above".Right now (Jan 1, 2015), there are 926 math exercises on Khan and 536 of them are for grades K-8. Which is exactly what they have over here. And then if you factor out a two here, you're just going to have a one left. Magenta color, two times x plus, we have just a y left when So, this is going to be two times x, I'll do the x in that same
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Is a factor of that term, it's a factor of that term,Īnd it's a factor of that term. Let's see if we factor outĪ two here, what happens? So, we do see that two Now, this one's interesting, it looks like they have factored out a two. Two-x plus two-y plus 2, so I can rule this one out. so, this one, this is two-x plus four-y plus four. And then these two x's right over here, I can just rewrite that as two-x. So, this is.actually, Iĭon't want to skip any steps.
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I could rewrite this x and this x, if I add them together Then I can add it to another x that would be two-x so So, the first thing that jumps out at me, before I even look at these choices, here I have an x over here, Which expressions are equivalent to x plus two-y plus x plus two? Select all that apply.
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