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serious [3.7K]
3 years ago
7

Find the 25th term of the arithmetic sequence when a1 = -14 and d = -5

Mathematics
1 answer:
rosijanka [135]3 years ago
6 0

Answer:

  a25 = -134

Step-by-step explanation:

For first term a1 and common difference d, the formula for the n-th term is ...

  an = a1 + d(n -1)

You want to evaluate this for n=25, a1=-14, d=-5. Filling in the numbers and doing the arithmetic, you get ...

  a25 = -14 -5(25 -1) = -14 -120

  a25 = -134

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Answer:

The pencil marks on your page show you exactly how to do that.

Step-by-step explanation:

Take advantage of two rules of exponents:

\sqrt[n]{x}=x^{\frac{1}{n}}\\\\x^{-n}=\dfrac{1}{x^{n}}

(d)\quad x^{\frac{-1}{5}}=\dfrac{1}{x^{\frac{1}{5}}}=\dfrac{1}{\sqrt[5]{x}}\\\\(h)\quad x^{\frac{-2}{11}}=\dfrac{1}{x^{\frac{2}{11}}}=\dfrac{1}{\sqrt[11]{x^{2}}}

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The exchange rate at the post office is £1=€1.17 how many euros will you get for £280
4vir4ik [10]

Question

The exchange rate at the post office is £1=€1.17 how many euros will you get for £280


Answer:

<h2>327.6 €</h2>

Step-by-step explanation:

you can solve with an equation

1£ : 1.17€ = 280£ : x

1 : 1.17 = 280 : x

x = 1.17 * 280 : 1

x = 327.6

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check

1 : 1.17 = 280 : 327.6

0.85 = 0.85

the answer is good

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or you can simpy solve with a multiplication

280 * 1.17 = 327.6



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Answer:

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Explanation:

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Given :

An airplane cuts through the morning sky for every 1,000 feet that he climbs the outside temperature drops 20° F.

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4 years ago
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