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3 years ago

What is the product? (9t-4)(-9-4)

Mathematics

1 answer:

grigory [225]3 years ago

4 0

Answer: The product of $(9t-4)(-9-4)$ is -117t+52.

Explanation:

The given expression is,

$(9t-4)(-9-4)$

Simplify the above expression.

$(9t-4)(-13)$

Use distributive property t simplify the above expression.

$(9t-4)(-13)=9t\times (-13)-4\times(-13)$

$(9t-4)(-13)=117t+52$

Therefore, the product of $(9t-4)(-9-4)$ is -117t+52.

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Kwans The Kenningy account balance was $20 his ending balance is zero dollars what integer represents the changing in his accoun

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The integer number that represents the changing in his account balance from beginning to end is of -20.

<h3>Which numbers belong to the set of integer numbers?</h3>

Non-decimal numbers, either positive or negative numbers, also zero, belong to the set, which can be represented by:

Z = {..., -3, -2, -1, 0, 1, 2, 3, ...}

A change can be represented by the <u>final value subtracted by the initial value</u>. For this problem, we have that:

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The final balance is of $0.

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Butyric acid ( c3h7cooh) is a weak acid . what is the ph of a 0.0250 m solution of this acid. ka = 1.5 x 10-5 (2 decimal places)

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The pH of the weak acid is 3.21

Butyric acid is known as a weak acid, we need the concentration of [H+] formula of weak acid which is given by this equation :

$[H^{+}]=\sqrt{Ka . Ma}$

where [H+] is the concentration of ion H+, Ka is the weak acid ionization constant, and Ma is the acid concentration.

Since we know the concentration of H+, the pH can be calculated by using

pH = -log[H+]

From question above, we know that :

Ma = 0.0250M

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By using the equation, we can determine the concentration of [H+]

[H+] = √(Ka . Ma)

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Substituting the value of [H+] to get the pH

pH = -log[H+]

pH = -log(6.12 x 10¯⁴)

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