3 years ago

I need help number 15

Mathematics

1 answer:

AysviL [449]3 years ago

4 0

Answer:

(2, -4)

Search in the 4th Quadrant. (Bottom Right)

Move right 2 times.

Move down 4 times.

(-4, 2)

Search in the 2nd Quadrant. (Top Left)

Move left 4 times.

Move up 2 times.

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The half-life of lead is 22 years. How long will it take for a sample of this substance t decay to 80% of its original amount?

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Answer: 7 years

Step-by-step explanation:

$t_{\frac{1}{2} }$ = In2 / ∧

since the half life is given , we have :

22 = In 2/ ∧

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Recall the formula for half life:

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Therefore:

0.80 = $e^{-0.032t}$

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t = In 0.80 / - 0.032

t = 7 years

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The product of the expression $(\frac{4k+2}{k^2-4})* \frac{k-2}{2k+1}$ is the expression $\frac{2}{k+2}$

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more variables and numbers.

Given the expression:

$(\frac{4k+2}{k^2-4})* \frac{k-2}{2k+1} \\\\This\ can\ be\ simplified\ to:\\\\(\frac{2(2k+1)(k-2)}{(k+2)(k-2)(2k+1)}) \\\\=\frac{2}{k+2}$

The product of the expression $(\frac{4k+2}{k^2-4})* \frac{k-2}{2k+1}$ is the expression $\frac{2}{k+2}$

Find out more on equation at: brainly.com/question/2972832

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2 years ago

I need help number 15​

I need help number 15