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  1. K

    Oxidation and Reduction in electrolysis??

    For HSC 2010 Chemistry question 33)b) I used the correct equations and got the final answer. However the sample answer's half equations says at the cathode oxidation occurs (equation flipped) while at the anode reduction occurs (equation did not flip). can someone please give me some insight on...
  2. K

    How often are General Solutions asked in the HSC?

    I'm currently studying for 3U and was wondering how often does the HSC actually ask General Solution questions? I've never really studied them or done any questions on them, but they seem extremely rare.
  3. K

    Integrations Volume Question Need Help! :(

    Find the volume of the solid of revolution formed if the area enclosed between the curves y=x^2 and y=(x-2)^2 is rotated about the x-axis.
  4. K

    Need Help for my Research Task!!!

    I have this assignment on how I need to find practical applications on trigonometric functions, and I found Aerospace engineering to be the most easiest since there are more sources on it on google. Now I have found formulas that have trig in them but my assignment says I need to show how to...
  5. K

    Research Task HELP!!!!!! Deriving Wind Correction Angle Formula or True Ground Speed

    I have this assignment on how I need to find practical applications on trigonometric functions, and I found Aerospace engineering to be the most easiest since there are more sources on it on google. Now I have found formulas that have trig in them but my assignment says I need to show how to...
  6. K

    Need assistance with what this means (Parametrix)

    Use the four standard forms to find the equation of the parabola with vertex at the origin and with the follow properties: a) axis vertical, passing through (4,1) b) axis horizontal, passing through (2,-2) I don't understand what it means by axis vertical/horizontal, if anybody can clarify...
  7. K

    Need help with motion of particle question

    A projectile is fired into the air and its height in metres is given by h = 40t − 5t^2 + 4, where t is in seconds. (d) What is the maximum height
  8. K

    Need help with Rates involving two or more variables

    Here is the question: If the volume of a cube is increasing at the rate of 23mm^3/second find the increase in its surface area when its side is 140 mm.
  9. K

    Probability Question

    To win a trifecta in a race, a person has to pick the horses that come first, second and third in the race. For a certain race, Marie wishes to bet on every combination possible to win the trifecta. If there are 12 horses in the race, how many combinations will she bet on? PS: Stuck on this...
  10. K

    Help with Integration question

    The region in the first quadrant bounded by the graphs of f(x)=(1/8)x^3 and g(x)=2x is rotated about the y axis. Find the volume of the solid formed.
  11. K

    Need quick help with this integral question.

    How would i integrate dx/(2x+5)^4
  12. K

    Some Trig Questions I Need Help With

    How would i find the exact value of cos(-225) and Sin(315), can you please show me how you got to it, i used to know this but when i was revising i was completely lost.
  13. K

    Trigonometry Question Help :L

    1)i)Given A,B and C are angles of a triangle and: TanA/5 = TanB/6 = TanC/7 = k, show that k= Square-root of 3/35 ii) Hence calculate the smallest of the angles to the nearest minute. I'm kind of lost in this question, any help would be great thanks!
  14. K

    Arithmetic Progression Problem

    Find the nth term of the arithmetic sequence 7,14,21,28 Dosent tell me what term to find so i don't know what to do.
  15. K

    Quadratic Question Need Help!

    y=x^2-6x+8 Factor and sketch the quadratic. Hence find the range of each function (i) with unrestricted domain. (ii) with domain x is greater than or equal to 5, (iii) with domain 0 is less than or equal x which is less than or equal to 5. Any help would be appreciated
  16. K

    Help Polynomials Question

    Given two roots of 2x^3 -kx^2+8=0 are equal, find k. Need help on this question so hard.
  17. K

    Polynomial Question need Help

    If alpha and beta are the roots of x^2 - 5x -5 = 0 find a^2+b^2, a^3+b^3 Is there a way i can manipulate the question to solve it or is there a rule that i must follow.
  18. K

    Trignometry Exact Ratios problem

    im stuck on this problem because the answer i get isnt what its suppose to be Evaluate: tan45 + tan60 over 1-tan45 x tan60
  19. K

    Need help with this simultaneous equation question!!

    y=x^3 y=x^2 Use substitution I know the answers are x=1 y=1 and x=0 y=0 but i dont know how people got x=1 y=1 with working out. Obviously it could be general knowledge but how did people get it. Please help
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