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seropon [69]
3 years ago
13

What is the sum of the arithmetic sequence 18 E t=1 (5t-4)

Mathematics
2 answers:
qaws [65]3 years ago
8 0

Question:

What is the sum of the arithmetic sequence 18 E t=1 (5t-4)

Answer & Step-by-step explanation:

We have to find the sum of Arithmetic series from t = 1 to t = 18 represented by (5t - 4)

The formula to find the sum of an Arithmetic series when first and the last term is known is:

S_{n}=\frac{n}{2}(a_{1}+a_{n})

n = Total number of terms = 18

a_{1} = First Term = 5(1) - 4 = 1

a_{18} = 18th Term = 5(18) - 4 = 86

Using the values in the above formula, we get:

S_{18}=\frac{18}{2}(1+86)\\S_{18}=9(87)\\ S_{18}=783

Thus, the sum of 18 terms of the given Arithmetic Series is 783.

dezoksy [38]3 years ago
7 0

The arithmetic sequence is:

\displaystyle\sum_{t = 1}^{18} (5t - 4)

The answer is:

783

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Use the table of reciprocals to find the reciprocal of these numbers:<br> 0.000 080 25 <br> 0.9596
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Answer:

1000000/8025 = 40000/321 (simplified)

1000/9596

Step-by-step explanation:

Hi there,

There is an alternative way to do this....

First it is important to understand what a reciprocal is. The reciprocal of any number x is the number 1/x. The reciprocal of a number is also its multiplicative inverse, which means that the number times its reciprocal must equal 1. For a number such as 2, the reciprocal would be 1/2. For a fraction such as 2/5, the reciprocal would be 5/2.

Finding the reciprocal of a decimal can be done in a number of ways.

Change the decimal to a fraction first.

Ex. 0.25 is 25/100 and is equivalent to the fraction 1/4. Therefore Its reciprocal would be 4/1 or 4.

Keep the decimal and form the fraction 1/?? which can then be or converted to a decimal.

Ex. 0.75 The reciprocal is 1/0.75. Using a calculator, the decimal form can be found by performing the operation: 1 divided by 0.75. The decimal reciprocal in this case is a repeating decimal, 1.33333....

After finding a reciprocal of a number, perform a quick check by multiplying your original number and the reciprocal to determine that the product is 1:

(0.25)(4) = 1.00

(0.75)(1.33....) = 1 but it is easier to see for sure with repeating decimals if you use the fractions instead of the decimals.

(3/4)(4/3) = 12/12 = 1

Hope this helps, Mark as brainliest if liked it! thanks!

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Answer:


Step-by-step explanation:

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