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From the top of a bldg. 60ft high, two observers are seen on the ground. The angle of depression to the two observer are 54 degrees and 24 degrees. If the two observers and the bldg. are standing on horizontal ground and if the two observers are on the same side of the bldg. how far are the observers from each other?
I need your help how to illustrate and solve it.

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2) find the valeue of k if |K 3|
|K 2K|=0

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What are the [H+] and [OH-] in a 0.1moldm^-3 solution of a weak acid (Ka = 1x10^-7)?

a) [H+] = 0.1, [OH-] = 1x10^-13
b) [H+] = 0.001, [OH-] = 1x10^-11
c) [H+] = 0.0001, [OH-] = 1x10^-10
d) [H+] = 1x10^-6, [OH-] = 1x10^-8

The answer is C but I want to know why.

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If A is an mxp matrix and b is pxn matrix then the order of AB is ..............

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write a complete program that prompts the user to enter the side of a hexagon and display its area. the formula for computing the area of a hexagon is Area = (3√3/2 )S^2, where S is the lenght of a side and √3 is 1.732

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Calculate the pH of the solution obtained by adding 0.02 lit of 1 mol./lit nitrous acid
(pKa=3.34) to 0.04 lit of 0.5 mol/lit sodium nitrite solution.

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Calculate the pH of a buffer mixture containing 10 ml of 0.1 M CH3COOH and 1 ml of 0.1
M, CH3COONa.

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A hockey puck has a mass of 210 g. If the hockey puck has 73 J of kinetic energy, what is its speed?

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A car with a mass of 1500 kg is moving at a speed of 50 km/h. what is its Ek.

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