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This is from the Cambridge Yr 11 Ext 1 textbook

The answers in the textbook are a bit off with the rounding...so could someone please do part b) ?

OMG thank you!!! i hope i'm not bothering you too much with all these questions haha

a) Find the x-coordinates of the points P and Q on y = (x − 7)^2 +3 such that the tangents at P and Q have gradients 1 and −1 respectively. b) Show that the square formed by the tangents and normals at P and Q has area 1/2 I got part a ... The coordinates are P= (7.5, 3.25), Q= (6.5, 3.25)...

Thanks! Did you manage to do q7 by any chance? :)

Question 6 A) Carbon monoxide is 43% carbon by mass; nitrous oxide is 30% nitrogen by mass. For both gases, the remainder is oxygen. In a mixture containing 5g of each gas, what is the mass of oxygen present? Question 7) In a carbon monoxide and nitrous oxide mixture, an analyst determines...

I was a bit confused so I thought I should ask here. In questions such as "indicate the type of bonding holding the atoms or ions in the compound together"...do you write either ionic/covalent/metallic or do you have to mention intermolecular forces as well (polar/non-polar, hydrogen bonding...

3) Bob, Betty, Ben, Brad and Belinda are to be seated at a round table. In how many ways can this be done: a if there are no restrictions, b if Betty sits on Bob’s right-hand side, c if Brad is to sit between Bob and Ben, d if Belinda and Betty sit apart, e if Ben and Belinda sit apart, but...

That's helpful advice, thanks!

Yes that’s right!

The answer for part c is correct but part d seems to add up to a different number. I thought about it a bit more...so in the 4 digit combinations, you can't do 4! because the first number has to be 1 or 3 (question asks numbers less than 4000) so it would be (1 x 3!) x 2 -->just for working out...

21 Numbers less than 4000 are formed from the digits 1, 3, 5, 8 and 9, without repetition. a) How many such numbers are there? b) How many of them are odd? c) How many of them are divisible by 5? d) How many of them are divisible by 3? Can somebody please help me with part c and d

Yep..chapter 14c i'm pretty sure

Yes that's correct, thanks!

14 a How many seven-letter words can be formed without repetition from the letters of the word INCLUDE? b How many of these do not begin with I? c How many end in L? d How many have the vowels and consonants alternating? e How many have the C immediately following the D? f How many have the...