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# OCR (not MEI) C1 - Wednesday 13th May 2015 watch

1. (Original post by chloe-jessica)
Y=(x/5)^1/2
so here scale factor 5 is 1/5, why isn't scale factor 3 not 1/3
2. (Original post by chloe-jessica)
Couldn't remember which way the x and y were. 2 and 1 were definitely right, though I probably got them mixed up when I was trying to remember what I wrote to post this. I'll change it now, thanks.
3. (Original post by Klaxoii)
Anyone else get 20 root 5 for the last one?
It wasn't just me! But yeah, everyone else I know got 40 so we're probably wrong. Did you get the distance from Q to P to be sq root 80 too?
4. (Original post by Spriggs3)
What do you guys think the raw mark for full UMS will be?
70+ surely
5. Grade boundary ideas then? Approx 63 do we reckon for an A? Or lower?

90 UMS probably 67+?
6. does anyone know the answer to this question?

circle: x^2+y^2-10x+4x+4=0

tangent: 3x+4y=32

P(8,2)

Q cuts y-axis at circle
R cuts y-axis at tangent

Area of triangle PQR= ?
7. Yeah that's just came up as all code.

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8. I think I got 68 which my guess is 90+ ums
9. (Original post by Invest)
Yeah that's just came up as all code.

Posted from TSR Mobile
yeah I just fixed it
10. Me😂 I'm glad I'm not the only one but I think we got it wrong😪😪
11. (Original post by falloutboyyy)
Doing c2 tomorrow????????
Sorry I meant FP1 - its alright though I'm not as dumb as I seem
12. How can you work out area is 40 when it's not a right angle triangle ??? So confused !!! X
13. (Original post by Molly_xox)
It wasn't just me! But yeah, everyone else I know got 40 so we're probably wrong. Did you get the distance from Q to P to be sq root 80 too?
Can see how u got that like me thought it was right angle so sq root 8 x10, I did 10 x10 tho
14. (Original post by Gcselong)
so here scale factor 5 is 1/5, why isn't scale factor 3 not 1/3
Are you talking about parallel to the x axis? If you are, it's because the x value itself is being multiplied by 3 (as the x was already the denominator of the fraction) which means the scale factor is 1/3. The whole function is being multiplied by 1/3 so the scale factor in the y direction would also be 1/3.
15. (Original post by ella_chloe)
someone posted a graph with the diagram and how they got the answer a couple of pages back x
thanks xxx
16. (Original post by Patsella)
How can you work out area is 40 when it's not a right angle triangle ??? So confused !!! X
It IS a right angles triangle. The right angle is just hidden half way down the y axis. The base was the distance between (0,8) and (0,-2) which is 10, and the height was from the y axis perpendicularly out towards the third point, (8,2), making the height the distance between (8,2) and (0,2), which is 8. So 8X10/2 is half base x height, which is 80/2=40
17. Pretty sure the question with the powers was (1/5 root 5)^3 so would be 5^-4.5
18. (Original post by Dj dizzy dave)
Pretty sure the question with the powers was (1/5 root 5)^3 so would be 5^-4.5
It was (5root5)^3. I think.
19. (Original post by Simonium1010)
It IS a right angles triangle. The right angle is just hidden half way down the y axis. The base was the distance between (0,8) and (0,-2) which is 10, and the height was from the y axis perpendicularly out towards the third point, (8,2), making the height the distance between (8,2) and (0,2), which is 8. So 8X10/2 is half base x height, which is 80/2=40
It wasn't a right angled as if you worked out lengths you wouldn't be able to use pythogoras to prove it.

1/2 x ab works for isocoleces too as long as you have the base and height
20. what was the graph transformation answer, was it 1/3 in the axis or 3 in the y axis

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