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8090 [49]
3 years ago
6

What is 1/2 a a decimal

Mathematics
2 answers:
pashok25 [27]3 years ago
6 0
Answer: .5

Explanation: 50/100
Lena [83]3 years ago
5 0

Answer:

0.5

Step-by-step explanation:

just divide 1 by half

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Calculate the sum of the first 15 terms of an arithmetic progression is the one where a3= 1 and a7=7. (I need the procedure plea
eduard

Answer:

S₁₅ = 127.5

Step-by-step explanation:

the nth term of an arithmetic progression is

a_{n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

given a₃ = 1 and a₇ = 7 , then

a₁ + 2d = 1 → (1)

a₁ + 6d = 7 → (2)

subtract (1) from (2) term by term to eliminate a₁

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4d = 6 ( divide both sides by 4 )

d = 1.5

substitute d = 1.5 into (1) and solve for a₁

a₁ + 2(1.5) = 1

a₁ + 3 = 1 ( subtract 3 from both sides )

a₁ = - 2

the sum to n terms of an arithmetic progression is

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ]

with a₁ = - 2 and d = 1.5 , then

S₁₅ = \frac{15}{2} [ (2 × - 2) + (14 × 1.5) ]

     = 7.5(- 4 + 21)

     = 7.5 × 17

     = 127.5

8 0
2 years ago
What is 2A- 3B, if A =<br> 12-13].and-[ -4 -2]
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Given that:

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Kazeer [188]

Answer:

24

Step-by-step explanation:

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2 years ago
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