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Cloud [144]
3 years ago
13

Let the sequence {an} be defined so that a1 = 1 and each succeeding term is found by adding 3 to the one before it. Find the for

mula representing an, the nth term of the sequence.
A) n - 2
B) n + 3
C) 3n - 2
D) 3n + 3
Mathematics
1 answer:
Sauron [17]3 years ago
6 0

Answer:

C

Step-by-step explanation:

The sequence is arithmetic with n th term

a_n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Here a₁ = 1 and d = 3, thus

a_{n} = 1 + 3(n - 1) = 1 + 3n - 3 = 3n - 2 → C

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The mean of 12 numbers is 20 and the mean of another 8 numbers is 25 find the mean of the 20 numbers
AysviL [449]

Answer:

22

Step-by-step explanation:

mean is calculated as

mean = \frac{sum}{count}

Given the mean of 12 numbers is 20 , then

\frac{sum}{12} = 20 ( multiply both sides by 12 )

sum = 240

Given the mean of 8 numbers is 25 , then

\frac{sum}{8} = 25 ( multiply both sides by 8 )

sum = 200

Total sum of the 20 numbers = 240 + 200 = 440, then mean of 20 numbers is

mean = \frac{440}{20} = 22

8 0
2 years ago
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NNADVOKAT [17]

Answer:

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Step-by-step explanation:

If you would square it then you would get 15.6.

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3 years ago
The race course is 3/4 of a mile long. How many feet long is the race course?
deff fn [24]

Answer:

3960 feet

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
Help plz. It’s number 6. Thanks
julsineya [31]
A = 1/2 h (a+b)
A / 1/2 h = a + b
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a = A / 1/2 h - b

Hope this helps
7 0
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Three shirts and two pairs of pants cost $40. Four shirts and one pair of pants cost $37.50. How much does one shirt cost?
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Answer:

d, 700

Step-by-step explanation:

it's the only one that makes sense

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