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Mathematics: Post your doubts here!

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I got the first one after some thinking :p

But the second part (9 cii) I can't seem to figure it out. It's not simultaneous equations cuz I looked at the mark scheme and atleast understood that much. Could you try solving it? I'd be ever so grateful! It's for 5 whole marks! :/
Ok I'll solve it ^_^
 
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Thank you! :D and maybe it is simultaneous, Idk I suck at math :(
It's easy :D
And yes, its simultaneous equation lol
So 1st equation is p+ q = 8.5 so q =8.5-p
2nd would be 1/2 (2)^3 + p(2)^2 + 2q = 27
So.... 4 + 4p +2q =27
And 4p + 2q = 27-4
4p+ 2q = 23

Now
4p + 2(8.5- p) = 23
4p + 17 - 2p =23
2p =6
p = 3

For q use the equation!!
8. 5 -p
sp 8.5- 3 = 5.5
:D
 
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It's easy :D
And yes, its simultaneous equation lol
So 1st equation is p+ q = 8.5 so q =8.5-p
2nd would be 1/2 (2)^3 + p(2)^2 + 2q = 27
So.... 4 + 4p +2q =27
And 4p + 2q = 27-4
4p+ 2q = 23

Now
4p + 2(8.5- p) = 23
4p + 17 - 2p =23
2p =6
p = 3

For q use the equation!!
8. 5 -p
sp 8.5- 3 = 5.5
:D

Um, How'd you come up with the second equation? How did you figure out it was equal to 27 and n is 2?
 
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They said used a value for n so I took n as 2 and the value was 27 because it is for the first x equation(S) if you read the sentence correctly so it was 18 + 9

Ohhh, I get it now! Thank you! :)

So I can also take 3 as n but that'll be equal to (18+9+30) right?
 
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