Question

@emcrazy14 read the next part of the question..

Answer 1

c) He made a profit of $20
i) write down an equation in x to represent this information, and show that it reduces to

\[3x^{2}+23x-500=0\]

@emcrazy14

Answer 2

hey @emcrazy14 ur friend needs us!!! :P

Answer 3

???????

Answer 4

*you

Answer 5

oh..

Answer 6

:)

Answer 7

Ok, let me solve it.

Answer 8

My equation does not reduce to the one given above. >_<

Answer 9

:(

Answer 10

@i got it:)

Answer 11

@emcrazy14 shall i show the working..

Answer 12

Yea sure. And another thing. Is that the profit per litre or the entire profit made from the sale?

Answer 13

entire

Answer 14

Ok, I got it as well! :)

Answer 15

:)

Answer 16

Ok, I'm having some trouble with rounding off. Can you please help me with this question?
Mary's height is 1.51m, measured correct to 3 significant figures. Find the least possible value of Mary's height.

Answer 17

1.505m

Answer 18

And how did you do that? O.o

Answer 19

logically, because if it is rounded to 3 sf, probably the 4th figure will show it....so, i just assumed it, i dont know how to explain..maybe its like this

1.51m---->if it is rounded to 3sf, then the values can be 1.514 or 1.505 (highest and lowest) so the lowest possible value would be 1.505!

Answer 20

Okay! Thank you! :D

Answer 21

no problem... u completed all the past papers of o level?

Answer 22

No. Not yet. O.o