Question

$\frac{1}{2(3x + 4y)} + \frac{1}{5(2x - 3y)} = \frac{1}{4} \\ \\ \frac{5}{(3x + 4y)} - \frac{2}{(2x - 3y)} = \frac{ - 3}{2}$
solve the following simultaneous equations
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Answer 1

Answer:

36x6 8(2)*27(9)

Step-by-step explanation:

This is the answer

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Answer 2

Well, you need to know the atomic weight of Platinum (Pt) and the number of atoms per mole. The answer to the former is 195.084 g/mole and the latter is 6.023 * 10^23 atoms/mole. Then, multiply everything as shown below:

Number of atoms = (1 g) * (1/195.084 g/mole) * 6.023 * 10^23 atoms/mole

Number of atoms = 3.087 * 10^21 atoms

Note, I’ve included units on everything and you can see that they all cancel except for atoms. Dragging the units along can be a pain but it is a great way to check that they way the numbers are being combined is correct.