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Natali [406]
3 years ago
12

Find the common difference if the 8th term is 55 and the first term is 13

Mathematics
1 answer:
Vlad [161]3 years ago
6 0

Answer:

Step-by-step explanation:

Equation

L = a + (n - 1)*d

Givens

L = 55

a = 13

n =8

Solution

55 = 13 + (8 - 1)*d               Combine

55 = 13 + 7d                       Subtract 13 from both sides

55 - 13 = 7d

42 = 7d                               Divide by 7

d = 6

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pickupchik [31]

Answer:

144 ways

Step-by-step explanation:

Let's think of the 3 persons sitting together as "one". So essentially we have 3 + "1" = "4" persons to arrange.

THey can be arranged in 4! ways, which is:

4! = 4 * 3 * 2 * 1 = 24 ways

Now, the 3 persons themselves can be arranged in 3! ways, which is:

3! = 3 * 2 * 1 = 6 ways

Total ways = 4! * 3! = 24 * 6 = 144 ways

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Answer:

The formula T= 10d +20

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3 years ago
Solve for v -7 v+3 = -63
denis23 [38]

Answer:

v = 66/7

Step-by-step explanation:

Step 1: Write equation

-7v + 3 = -63

Step 2: Solve for <em>v</em>

<u>Subtract 3 on both sides:</u> -7v = -66

<u>Divide both sides by -7:</u> v = 66/7

Step 3: Check

<em>Plug in x to verify if it's a solution.</em>

-7(66/7) + 3 = -63

-66 + 3 = -63

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8 0
3 years ago
Read 2 more answers
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