Maths AQA Spec B Calc thread

How do u do bounds

To clear it up these were the answers for the harder questions

The CosA was 132 degrees. (using reverse of cosine rule by re-arranging it)
Algebraic fractions was -0.78 and -2.78
The guy was too tall for the tent (can't remember what I exactly did, think using pythagoras)
Similar shapes one I forgot kappa, I know I got it wrong but scale factor to power of 3 is what you shoulda used according to surina
Histogram was nice and simple.
The area of the 40x^2 was easy, just divide it by 8 to get the 5x^2 area.
The 49c^2-d^2 was using the method of (7c+d)(7c-d) where -7cd and +7cd cancel each other out nicely.
For the bread types, you know there were ratios of 10 across the breads, 6:1:3, so 130/10 = 13, and then just do 6x13 e.t.c
Simultaneous equations = 20 and 12
Boats was 90km

Hope this clears it up with some of you guys

What was the straight line that went through 0,4?

For the boat one, it asked for the answer to be to 2sf. I put 90.1 - is that right?

Also, I put for the factorising one 49c-d(c-d) - is this right?

I got -0.255 for the quadratic formula one?

5 and 18

Does anyone have what they put/how to work it out, for the shaded shape question, where it was 1440 for the area? I just blanked

You'll lose one mark for putting the .1, as it's only 0's after the decimal which don't count as SF and the factorising one is wrong, the answer I believe was (7c+d) (7c-d) as the -7cd and +7cd cancel each other out!

The area of the 40x^2 was easy, just divide it by 8 to get the 5x^2 area.

I think I got 180, can''t remember

Does anyone have what they put/how to work it out, for the shaded shape question, where it was 1440 for the area? I just blanked

Not sure mate, I don't think that's correct from what I heard.

I got -0.78 and -0.255

so did a lot of my friends

I got -0.78 and -0.255

so did a lot of my friends