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serg [7]
4 years ago
15

The sum of 6 consecutive even numbers is 126.what is the fourth number in this sequence

Mathematics
2 answers:
loris [4]4 years ago
8 0
6x + 2 + 4 + 6 + 8 + 10 = 126
6x + 30 = 126
6x = 96
x = 16
Numbers are {16,18,20,*22*,24,26)
Correct answer is 22.
erastovalidia [21]4 years ago
6 0

Answer:

fourth number in this sequence is 22.

Step-by-step explanation:

Given  : The sum of 6 consecutive even numbers is 126.

To find : .what is the fourth number in this sequence.

Solution : We have given

sum of 6 consecutive even numbers is 126.

Let the 6 consecutive even numbers are = x , x +2 , x + 4 , x + 6 ,x + 8 , x + 10

According to question

Sum of all 6 numbers

x + x +2 + x + 4 + x + 6 + x + 8 + x + 10 =  126 .

On adding like terms

6x + 30 = 126 .

On subtracting both sides by 30.

6x = 126 -30 .

6x = 96.

On dividing both sides by 6

x = 16 .

Then fourth number is x + 6

16 + 6 = 22,

Therefore, fourth number in this sequence is 22.

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erik [133]

Initial salary =  $50,000 .

Rate of raise = 5% each year.

Therefore, each next year salary would be 105% that is 1.05 times.

5% of 50,000 = 0.05 × 50000 = 2500.

Therefore raise is $2500 each year.

According to geometric sequence first term 50000 and common ratio 1.05.

Applying geometric sequence formula

a_n = ar^{n-1}

1) a_n = 50000(1.05)^{n-1}

2) In order to find salary in 5 years we need to plug n=5, we get

a_5 = 50000(1.05)^{5-1}= 50000(1.05)^4

= 50000(1.21550625)

<h3>=$60775.3125.</h3>

3) In order to find the total salary in 10 years we need to apply sum of 10 terms formula of a geometric sequence.

S_n = \frac{a(1-r^n}{1-r}

Plugging n=10, a = 50000 and r= 1.05.

S_10 = \frac{50000(1-(1.05)^{10}}{1-1.05}

S_10 = \frac{50000(0.050)^{10}}{0.05}

= 628894.62678.

<h3>Therefore , you will have earned $ 628894.62678 in total salary by the end of your 10th year.</h3>



7 0
3 years ago
7 2/15+52/3+9 13/15 a. 20 2/3 B.21 10/15 C.21 2/3 D.22 2/3 pls do i will mark brainlessness
Andreyy89

Answer:

101/3 or 33 2/3

Step-by-step explanation:

7 2/15=107/15

9 13/15=138/15

107/15+52/3+138/15

107/15+138/15+52/3

245/15+52/3

245/15+260/15

505/15

simplify,

101/3

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Answer:

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Step-by-step explanation:

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