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seriously there's sumthing wrong with u New South Wales kids. Ur missing a few brain cells i think!!!!

The populations of Cook Islands and Niue in the South Pacific has been decreasing at an average rate of 2½% per year over the last 5 years. If the combined population was 23400 in 2007 Define all terms clearly. a) General formula for Half-Life, knowing the rate of change: For the given rate of...

Does anyone know how to draw a sketch of the circuit, showing the generator (source), homestead (represented by a resistance), current by symbol I, and the 200 V voltage as VH.

A particular car travels 20000km in a year and operates at a 20% effiency in transforming the chemical energy in fuel into mechanical energy(motion). The car has a fuel consumption of 10L per 100km and its petrol tank holds 50L a. The amount of energy supplied by a full tank of petrol b. the...

A temperature rise of 1.78oC was observed when 1.00*10^-3 mol of propane gas was burnt in a calorimeter. The calibration factor of the calorimeter was previouly determined to be 1250J oC^-1 1. calculate the heat of combustion of propane in kJ mol-1

1. Find the coordinates of P, the point of intersection of the curves y=e^x and y=2+3e^(-x). If these curves cut the y-axis at points A and B respectively, calculate the area bounded by AB and the arcs AP and BP. Give you answer correct 3 decimal places. 2. differentiate f(x)= loge(x) /...

For Q1, the book has it as -3loge |2x-5|+c, where the 2x is positve and the 5 is negative. why is that? Q2. i don't get the point of this step y' = 6u^-2.du.(dx/du) dx/du = -1/2 Q3. same problem as question 1, the book has it as y = -1/3 log|-4+3x| +C Q4. the back of the said the answer...

thanks

integrate 1. 6/(5-2x) dx 2. 6(1-2x)^-2 dx 3. (4-3x)^-1 dx 4. find y in terms of x for each of the following dy/dx= 1/(2x) and y=2 when x=e^2 Thanks

1. The OCl- ion acts as a base in water according to the equation OCl-(aq) + H2O(l) HOCl(aq) + OH-(aq) When two drops of 5.0 M NaOH are added to an equilibrium mixture of OCl in water at constant temperature what is the effect on equilibrium? 2. Benzoic acid, C6H5COOH, molar mass 122 g mol-1...

1. For pi/2< a < pi with sin a=cos b where 0<b<(pi/2), find a in terms of b 2. For pi/2< a < pi with cos a = -sinb where 0<b<(pi/2), find a in terms of b thanks

More questions, 1.a If a log2 7= 3- log6 14, find the value of a, correct to three significant figures b. If log3 18= log11 k, find the value of k, correct to one decemial place 2. Solve- 3^(2x) - 3^(x+2)+8=0 Thanks

Hey, these are questions i had trouble with Solve the following for x, b. log e (5x) - log e (3-2x) +1 c. Log e (x) + log e (3x+1)=1 d. (8e^-x) - e^x =2 Simplify, a. 1+ log10 a - (1/3)log10 b b. log2 x -2log2 y + log2(xy^2) Evaluate, a. log2 square root 2 + log2 1 +2log2 2 Thanks

<H1 class=subject>Systematic name for CH3(CH2)7CH2Cl? how do you find the systematic name for CH3(CH2)7CH2Cl. How do you decide if its an alkane or alkene? </H1>

i'm still a little confused about Q3 why did you balance it with 02- and how did u know to do this (where did it suggest in the question) ? Also, how did u do Q3 b, like where did Al2O3 come from? when balancing half equations, in what instances do you use oxygen to balance the equation...

1. 2S2O4 -2(aq) + H20(l) = S2O3 -2(AQ) + 2HSO3 - (aq) Write the ionic half equations for the oxidation and reductions that occur when sodium dithionite is mixed with water 2. In dry cells commonly used in torches, an electric current is produced from the reaction of zinc metal with MnO2...

How do u find the charges (C, N, O) in Cu(NO3)2? i don't get why (NO3)2 has a charge of 1 And how did you know the charge of Cu was 2+, its a transition metal

1. If you were to do an experiment to graph the effect of various substrate concentrations, would have on reaction rate and concentration of product, how would u describe the graph. (i know it go up and eventually reaches a plateau, but how would you describe this, i don't know what to say, it...

thanks man

1. The chlorine in a .63g sample of chlorinate pesticide, DDT (C14H9Cl5), is precipitated as silver cloride. What mass of silver chloride is formed? 2.A precipitate of Fe2O3, of mass 1.43g, was obtained by treating a 1.5L sample of bore water. What was the concentration of iron, in molL-1, in...