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MissTica
3 years ago
9

قالت تبيلة: هذه صديقتي، ... رينا، هي طالبة جديدة أيضا.​

Mathematics
2 answers:
kobusy [5.1K]3 years ago
3 0

Answer:

duk u what language is this

Step-by-step explanation:

osjzmzmnsmakzjk

nzjsjsjsm

ushdjsjskdjdm

mjsjsjsjsksjsj

hshsjajsnxjeomdms

emmasim [6.3K]3 years ago
3 0

Answer نعم

Step by step:

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FIND THE SUM OF 20 TERMS OF THE ARITHMETIC SERIES IN WHICH 3rd TERM IS 7 AND 7th TERM IS 2 MORE THAN THREE TIMES ITS 3rd TERM
algol13

Answer:

740

Step-by-step explanation:

The n th term of an arithmetic series is

a_{n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

Given a₃ = 7 and a₇ = (3 × 7) + 2 = 21 + 2 = 23 , then

a₁ + 2d = 7 → (1)

a₁ + 6d = 23 → (2)

Subtract (1) from (2) term by term

4d = 16 ( divide both sides by 4 )

d = 4

Substitute d = 4 into (1)

a₁ + 2(4) = 7

a₁ + 8 = 7 ( subtract 8 from both sides )

a₁ = - 1

The sum to n terms of an arithmetic series is

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

S_{20} = \frac{20}{2} [ (2 × - 1) + (19 × 4) ]

     = 10(- 2 + 76) = 10 × 74 = 740

8 0
3 years ago
Simplify the expression by combining like terms -4f-9-f+15​
shusha [124]

Answer:

-5f+6

Step-by-step explanation:

-4f-f = -5f

15-9= 6

Answer is -5f+6

Hope this helps!

4 0
2 years ago
Read 2 more answers
Hi what is the answer for this?
Marat540 [252]
I believe it's A I really hope that's right
6 0
3 years ago
Read 2 more answers
Tell me the answer ​
romanna [79]
Show a picture or type the question so we can give you an answer please.
5 0
3 years ago
PLEASE HELP ME PLEASE PLEASE I NEED YOUR HELP PLEASE HELP ME Which of these expressions demonstrates the identity property? Chec
Delicious77 [7]

Answer:

1st one and the third one

Step-by-step explanation:

25(0)=25

25+0=25

3 0
3 years ago
Read 2 more answers
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