3 years ago

Hey:) can you please help me posted picture of question

Mathematics

2 answers:

Vanyuwa [196]3 years ago

6 0

The answer is A. Just remember the acronym for foil.

sweet [91]3 years ago

6 0

Answer:
x² - 5x - 24

Explanation:
To answer this question, we will multiply each term from the first bracket by each term from the second bracket and then we will combine like terms to get the final expression.

This can be done as follows:
(x - 8)(x + 3)
x(x) + x(3) - 8(x) - 8(3)
x² + 3x - 8x - 24
x² - 5x - 24

Hope this helps :)

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Here is how I completed the problem:

I started by creating a ratio:

$\frac{x}{0.18} + \frac{360}{0.10} = \frac{x+360}{0.15}$

Where 'x' is the desired amount of the 18% solution of sulfuric acid.

From here, I solved for 'x':

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∴You will need to add 1080ml of 18% Sulfuric Acid in order to obtain a 15% solution.

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