Well if there are 85 questions and 20% of them are correct, basically 20% means 20/100 which when reduced is equivalent to 1/5. so then you would take 85 and multiply it by 1/5 to get 17. He got 17 questions correct
I showed you two different ways to get the same answer one with a fraction and one with a decimal. I think doing percentages as decimals is easier but thats just me.
The diameters intersect at the center of the circle m<BKD = 100 <AKC is vertical to <BKD, so m<AKC = 100 An arc has the same measure as its central angle, so m(arc)AC = 100
