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JulijaS [17]
2 years ago
6

Which of the following represents the sum of the series below?

Mathematics
1 answer:
hoa [83]2 years ago
5 0

4 + 7 + 10 + 13 + 16 + 19 + 22 + 25 + 28 + 31 + 34 + 37 + 40 = 286

I hope this helps!

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Help me asap! I will give you marks
Law Incorporation [45]

Recall the binomial theorem.

(a+b)^n = \displaystyle \sum_{k=0}^n \binom nk a^{n-k} b^k

1. The binomial expansion of \left(1+\frac x3\right)^7 is

\left(1 + \dfrac x3\right)^7 = \displaystyle\sum_{k=0}^7 \binom 7k 1^{7-k} \left(\frac x3\right)^k = \sum_{k=0}^7 \binom 7k \frac{x^k}{3^k}

Observe that

k = 1 \implies \dbinom 71 \left(\dfrac x3\right)^1 = \dfrac73 x

k = 2 \implies \dbinom 72 \left(\dfrac x3\right)^2 = \dfrac73 x^2

When we multiply these by 8-9x,

• 8 and \frac73 x^2 combine to make \frac{56}3 x^2

• -9x and \frac73 x combine to make -\frac{63}3 x^2 = -21x^2

and the sum of these terms is

\dfrac{56}3 x^2 - 21x^2 = \boxed{-\dfrac73 x^2}

2. The binomial expansion is

\left(2a - \dfrac b2\right)^8 = \displaystyle \sum_{k=0}^8 \binom 8k (2a)^{8-k} \left(-\frac b2\right)^k = \sum_{k=0}^8 \binom 8k 2^{8-2k} a^{8-k} b^k

We get the a^6b^2 term when k=2 :

k=2 \implies \dbinom 82 2^{8-2\cdot2} a^{8-2} b^2 = 28 \cdot2^4 a^6 b^2 = \boxed{448} \, a^6b^2

6 0
1 year ago
Every month, a company increases its sales by twice the previous month. The company experienced 23 sales in January, 46 sales in
wariber [46]
23, 46, 92, 184, 368, 736, 1472, 2944, 5888.

The company will have 5888 sales.
3 0
3 years ago
What is an equation of the line that passes through the points (0, -1)(0,−1) and (6, 1)(6,1)?
horrorfan [7]

slope = y2 - y1 \div x2 - x1

1 -  - 1 \div 6 - 0

2 \div 6

1 \div 3

y = mx + c

1 = 1 \div 3 \times 6 + c

1 = 2 + c

c = 3

y = 1 \div 3x + 3

5 0
3 years ago
Five less than three times a number
Radda [10]

That would turn into 3x-5

4 0
2 years ago
The following data shows the changes in tempreatures across varius cities from moorning to noon. which city recorded the maximum
fgiga [73]
25 because it is cool and it is the maximum weather in the earth totally
6 0
3 years ago
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