Yeah, much harder than I expected. I sort of understood how to do most of them but how did you do the last one about annuities??
I used the table to find the total value of the first 20 days and add it to the next 10 (or 11?) days to get a total. Then i think i went to far by trying to turn it to a present value. I should get some working marks though.
Yeah ok, I did something similar...But I was confused abut the effect taking money out would have.
You mean years right?
oh yeah, my bad i'm already forgetting those horrid questions
I can't remember the final answer but I for the gradient 'b' I got 2 point something and then just lugged the rest of the numbers into the formula.
29 or something i think
Haha, I was just making sure I hadn't screwed up majorly in the exam.
Yeh the formula was like y=-10...+bx and the temperature was 19 degrees so with a gradient of roughly 2 that works out being about 29.
I got 29
Yeah I think it was about 101. It was pretty easy because if you write out the z score formula they both had Z as the subject so they had to equal each other.
it was just making the two equations equal to each other. Simultaneous equations is when you have to find two unknown variables. in this question there was only one unknow variable - his IQ
It was making the two equations for finding Z score equal to each other. I got 101