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Novay_Z [31]
4 years ago
13

The nth term of a sequence is n2+20a)What is the first three terms of the sequence?

Mathematics
1 answer:
notka56 [123]4 years ago
6 0

a_n=n^2+20\\\\a)\\a_1=1^2+20=1+20=21\\a_2=2^2+20=4+20=24\\a_3=3^2+20=9+20=29\\\\Answer:\ 21;\ 24;\ 29\\\\b)\\n^2+20 < 50\ \ \ |-20\\\\n^2 < 30\to n < \sqrt{30}\ \wedge\ n\in\mathbb{N^+}\to\ n\in\{1;\ 2;\ 3;\ 4;\ 5\}\\\\Answer:\ 5\ terms

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posledela

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Step-by-step explanation:

7 0
4 years ago
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The tangent is the ratio of the lengths of legs.
In general, tan x = opp/adj
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3 years ago
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What is the answer to 45 − (−28) =
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Step-by-step explanation:

You can also write it as 45+28.

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4 years ago
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5. Suppose you are the manager of a music store. At the end of one week you are going over
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Answer:

Step-by-step explanation:

x = cheaper compact disc

y = more expensive compact disc

x + y = 375.....x = 375 - y

12.95x + 14.95y = 5306.25

12.95(375 - y) + 14.95y = 5306.25

4856.25 - 12.95y + 14.95y = 5306.25

4856.25 + 2y = 5306.25

2y = 5306.25 - 4856.25

2y = 450

y = 450/2

y = 225 <==== there were 225 of the more expensive compact discs sold

x + y = 375

x + 225 = 375

x = 375 - 225

x = 150 <==== there were 150 of the cheaper compact discs sold

check...

12.95x + 14.95y = 5306.25

12.95(150) + 14.95(225) = 5306.25

1942.50 + 3363.75 = 5306.25

5306.25 = 5306.25 (correct)

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3 years ago
Consider the sequence 2, 8, 3y + 5, ...
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