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ladessa [460]
3 years ago
7

find the sum of the first 20 terms of an arithmetic sequence with a first term of -14 and a comman difference of 4​

Mathematics
1 answer:
timama [110]3 years ago
7 0

Answer:

480

Step-by-step explanation:

Sn = n÷2 × (2a + (n-1)d)

n = 20 a = -14 d = 4

S20 = 10 × (-28 + 19 × 4) = 480

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Please help worth 20 points! (this is legit my math grade .-.)
Natasha2012 [34]

Answer:

Step-by-step explanation:

a true

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2 years ago
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In ΔVWX, \text{m}\angle V = (7x-1)^{\circ}m∠V=(7x−1) ∘ , \text{m}\angle W = (4x+16)^{\circ}m∠W=(4x+16) ∘ , and \text{m}\angle X
Anika [276]

Answer:

m∠X= 22°

Step-by-step explanation:

In ΔVWX:

m∠V=(7x−1) ∘

m∠W=(4x+16) ∘ ,

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Step 1

We find the variable x

The sum of angles in a triangle is 180°

Hence,

ΔVWX = m∠V + m∠W +m∠X

180° = (7x - 1)° + (4x + 16)° + (3x - 17)°

180° = 7x - 1 + 4x + 16 + 3x - 17

180° = 7x + 4x + 3x - 1 + 16 - 17

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Collect like terms

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x = 182°/14

x = 13°

Step 2

We find m∠X

m∠X = (3x−17) ∘

x = 13

m∠X = (3 × 13 − 17)°

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5 0
2 years ago
My question is in the image
Alecsey [184]

Answer:

13.2 miles

Step-by-step explanation:

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Therefore, the shortest route from Chenoa to Robertsville is about 13.2 miles.

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2 years ago
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Karo-lina-s [1.5K]

Answer:

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2 years ago
35 POINTS
dmitriy555 [2]
If the lines are parallel, they have no solutions because they never touch
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3 years ago
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