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guajiro [1.7K]
2 years ago
13

The value of a machine depreciates each year by 5% of its value at the beginning of that year. If its value when new on 1st Janu

ary 1980 was # 10,250. 00, what was its value in January 1989 when its was 9years old. Give your answer correct to three significant figures.
Mathematics
1 answer:
Artemon [7]2 years ago
8 0

\qquad \textit{Amount for Exponential Decay} \\\\ A=P(1 - r)^t\qquad \begin{cases} A=\textit{current amount}\\ P=\textit{initial amount}\dotfill &10250\\ r=rate\to 5\%\to \frac{5}{100}\dotfill &0.05\\ t=\textit{elapsed time}\dotfill &9\\ \end{cases} \\\\\\ A=10250(1 - 0.05)^{9}\implies A=10250(0.95)^9\implies A\approx 6460

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Hope someone can help me with this
Norma-Jean [14]
Hi,

To find the volume of cylinder this formula is required.

v = \pi {r}^{2} h

To get radius you need to divide diameter with 2 like this.

80 \div 2 = 40

Now just put your values into formula.

v = \pi {40}^{2}  \times 130 \\ v =653451.27

You will need 653451.27 cubic centimetres of concrete.

Hope this helps.
r3t40
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3 years ago
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Now that we’ve learned how to solve word problems involving the sum of consecutive integers, let’s narrow it down and this time, focus on word problems that only involve finding the sum of consecutive even integers.

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Answer:

Yea

Step-by-step explanation:

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Go to settings

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