simon9867 Posted May 12, 2016 Report Share Posted May 12, 2016 42 minutes ago, Kristina Rollová said: that makes sense So maybe the answer was the -0.2... but actually as an absolute value which means that p= 0.2... (I dont really remember the exact value but it was something similar) What u say is correct if u wanted to calculate the distance, but it asked for the displacement. Reply Link to post Share on other sites More sharing options...
TI-84 Plus Posted May 12, 2016 Report Share Posted May 12, 2016 1 hour ago, ibstudent77 said: Did anyone get 2 sets of coordinates for the last vector question? I got quadratic equations for the values of x y z and so got 2 values for each. For the gradient question did anyone get -1.06? Which values did you get for the coordinates?? Reply Link to post Share on other sites More sharing options...
Apple Posted May 13, 2016 Report Share Posted May 13, 2016 4 hours ago, TI-84 Plus said: Which values did you get for the coordinates?? I only got one value for each coordinate. One of which I think was a 3... Couldn't remember the other two. Reply Link to post Share on other sites More sharing options...
Khaos Posted May 13, 2016 Report Share Posted May 13, 2016 At least personally, everyone that I have talked to and myself found this paper very challenging. I know the average questions completed in my class was 6 out of 10. I think this result was largely due to the exam focusing quite a bit on Statistics, Probability and Vectors which are not included in my government regulated curriculum. Due to this we kind of glossed over the topics. Reply Link to post Share on other sites More sharing options...
TI-84 Plus Posted May 13, 2016 Report Share Posted May 13, 2016 16 hours ago, kevG said: There was also a question about a car and the year this girl will sell it... I don't remember the question but I do know that the year it will be sold is 2019 How did you get this??? Because the value of the car was like 11,000 and the price falls 5% every year. And didn't the girl wanted than to sell the car for 10,000?? Reply Link to post Share on other sites More sharing options...
kevG Posted May 13, 2016 Report Share Posted May 13, 2016 7 hours ago, TI-84 Plus said: How did you get this??? Because the value of the car was like 11,000 and the price falls 5% every year. And didn't the girl wanted than to sell the car for 10,000?? the value of the car was 16100 (i remember that they wanted it till the nearest hundredths) and i just used the compound interest formula but with a 5% decrease so you get like 0.95 interest rate... just equated it to 10000 and got like t as 9.5 something years and if you add it onto the 2010 you're still in 2019 Reply Link to post Share on other sites More sharing options...
inriya Posted May 13, 2016 Report Share Posted May 13, 2016 8 hours ago, kevG said: the value of the car was 16100 (i remember that they wanted it till the nearest hundredths) and i just used the compound interest formula but with a 5% decrease so you get like 0.95 interest rate... just equated it to 10000 and got like t as 9.5 something years and if you add it onto the 2010 you're still in 2019 10000=16100*(0.95)^n If it is 9.5, answer is not 2019, it should be 2020 because 2019 is still $10000< . Hope it helps Reply Link to post Share on other sites More sharing options...
kevG Posted May 13, 2016 Report Share Posted May 13, 2016 10 minutes ago, inriya said: 10000=16100*(0.95)^n If it is 9.5, answer is not 2019, it should be 2020 because 2019 is still $10000< . Hope it helps Umm sorry but you're wrong I just redid it and the correct value for t is 9.28 years. The lady bought her car on the 1st of January and the number of years it takes for her to sell her car from the 1st of Jan is 9.28 years. So whatever rounding you do, you still end up somewhere inside 2019. The question asked us the year when she will sell her car and the year she sells it is in 2019... Reply Link to post Share on other sites More sharing options...
felixzerbib Posted May 14, 2016 Report Share Posted May 14, 2016 2 hours ago, kevG said: Umm sorry but you're wrong I just redid it and the correct value for t is 9.28 years. The lady bought her car on the 1st of January and the number of years it takes for her to sell her car from the 1st of Jan is 9.28 years. So whatever rounding you do, you still end up somewhere inside 2019. The question asked us the year when she will sell her car and the year she sells it is in 2019... Hey, I also found 2020, as the value i found for n was about 10.3 Reply Link to post Share on other sites More sharing options...
ShootingStar16 Posted May 14, 2016 Report Share Posted May 14, 2016 Paper 2 was horrid for me Reply Link to post Share on other sites More sharing options...
usernamed Posted May 14, 2016 Report Share Posted May 14, 2016 (edited) I sat the TZ2 math studies exam Is it just me but were they actually difficult? Especially paper 2. :/ Edited May 14, 2016 by Nadsxo2 Reply Link to post Share on other sites More sharing options...
kevG Posted May 14, 2016 Report Share Posted May 14, 2016 5 hours ago, felixzerbib said: Hey, I also found 2020, as the value i found for n was about 10.3 I think you did the t-1 equation from a geometric sequence. You needed to realize that in a geometric sequence, when you use t-1, you also include the start of the on the sequence so you will be one off when finding the remaining cost (finding the 1st in the sequence will give you the original value, but finding the second you will get the value after 1 year). I also wanted to do that but I figured that it would be better to use the tradition compound interest formula to do it since I wanted to find the definite cost at a given time.(And they said "after 6 years" if I remember correctly) Or you know, I'm just wrong Reply Link to post Share on other sites More sharing options...
TheNintendoChip Posted May 14, 2016 Report Share Posted May 14, 2016 Any other TZ1s? .o/ I felt better about Paper 2 than Paper 1, I could answer the questions easily. The only one which threw me off was the probability question (8), part d. I discussed it with my teacher afterwards, though, and I think I did it right. Reply Link to post Share on other sites More sharing options...
ellie Posted May 14, 2016 Report Share Posted May 14, 2016 I did TZ2 but felt that much better about this than Paper 1, too! I didn't have time for the last questions, with the area under the curve, but more or less finished all others. :') Reply Link to post Share on other sites More sharing options...
Figuresk8rA10 Posted May 14, 2016 Report Share Posted May 14, 2016 I did TZ1, and I found it pretty challenging... Especially the probability and vector questions. The proofs with vectors really threw me off Reply Link to post Share on other sites More sharing options...
inriya Posted May 15, 2016 Report Share Posted May 15, 2016 On 5/13/2016 at 7:21 AM, kevG said: Umm sorry but you're wrong I just redid it and the correct value for t is 9.28 years. The lady bought her car on the 1st of January and the number of years it takes for her to sell her car from the 1st of Jan is 9.28 years. So whatever rounding you do, you still end up somewhere inside 2019. The question asked us the year when she will sell her car and the year she sells it is in 2019... I didn't have my calculator with me that time when I typed it. I forgot what I wrote though :(, but thank you for pointing that out! Reply Link to post Share on other sites More sharing options...
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