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Hang on. How do you know that a 60% in MX2 is a band 6? You dont really know their raw marks...

Yea i got that. But I think, you missed a line of working. It should be 33750s^-1 + (750(125/2+s/250). I think...

Did any1 get sqrt(11250) as an answer?

The cost of operating a truck on a highway is made up of running costs plus the driver's wage. The running costs are (0.25 + s/250) dollars per kilometre where S is the speed of the truck in km/h and the truck dirver's wage is $45 per hour. At what speed should the driver travel to make a 750...

I was extremely sad after reading Death of a Salesman. It wasnt just about the death of willy, but something so true about what Miller describes.

WHAT? When did all the asians turn white?

trolls these days...

very nice. Ive got it. THanks very much.

um, no calculus is involved i think. Cause its under quadratic function. + I dont think (1,3) is actually on the parabola. BTW: The above is right 90%. But i dont get it...

Find the equation of the two lines which contain the point (1,3) and are tangent to the parabola y = x^2-2x+5

Did any1 somehow, could find the minimum area as well? Thats really weird as Ive never seen anything like this. Thanks for the question Anna.

wk 9-10. Stupid cause we have a few assessments before that...

Perhaps trig subs is far beyond me. Under which general topic is that under? O I see. It was in the Cambridge book, under the heading of Equations reducible to quadratics. THus I assumed subsitution was need. THanks for advice Jetblack and gurmies.

jetblack, mind if I ask what the topic is?

2.3 tan(x)-2 cot(x)+3 sec(x) = 0 3(sinx/cosx) - 2(cosx/sinx) + 3/cosx = 0 3sin^2x - 2(cos^2x) + 3sinx = 0 simplify: 5sin^2x+3sinx-2 =0 etc... solve

1.5sin^2(x) -4sin(x) cos(x)+3cos^2(x) = 2 Divide everything by cos^2 or sin^2 5tan^2x-4tan^2x+3 = 2sec^2 5tan^2x-4tan^2x+3 = 2tan^2x+2 3tan^2x-4tanx+1=0 tanx = 1/3 or 1 x = 18degree 26 min, or 45 degree

How to solve this question using subsitution: \sqrt(5+x) + \sqrt(x) = 5 Thanks

Obviously she has treated you unfairly and is very inappropriate conduct. So rage, rage, against her. Perhaps threaten to sue her and report her to DOE if she dosent give you good marks from now on. Use this to your advantage! Blackmail has its purposes in society!

One more question. INteressted in how you guys would set it out. Find the largest rectangle that can be inscribed in the region bounded by the parabola with equation y = 4-x^2 and the x-axis. This is done purely using differenttiation.

consider the c(x) as d(v/40 + 10v^-1) through expanding and then differentiate. Btw: its tricky cause there is two variable, i.e. d and v, but d can be considered as a constant.