2 years ago

Write an expression equivalent to - 3+ y - 4 - 12/31

Mathematics

1 answer:

klemol [59]2 years ago

7 0

I have no idea
I just need points for an answer sorry

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The sum of the first n terms of an arithmetic sequence is n/2(4n + 20).

lesantik [10]

Answer:

(a).

$S_{n} = \frac{n}{2} (4n + 20) \\ \\S _{n - 1} = \frac{(n - 1)}{2} (4n - 4 + 20) \\ \\ S _{n - 1} = \frac{(n - 1)}{2} (4n + 16) \\ \\S _{n - 1} = \frac{(n - 1)(4n + 16)}{2} \\ \\ { \boxed{S _{n - 1} = {2 {n}^{2} + 6n - 8}}} \\$

(b).

from general equation:

$S _{n - 1} = \frac{(n - 1)}{2} (4n + 16)$

first term is 4n

common difference:

$16 = \{(n - 1) - 1 \}d \\ 16 = (n - 2)d \\ d = \frac{16}{n - 2}$

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2 years ago

5 pounds is how many ounces

chubhunter [2.5K]

Answer:

80 ounces

Step-by-step explanation:

There are 16 ounces in a pound. So to convert from pounds to ounces, you multiply 5 by 16, which is 80.

4 0

2 years ago

Can I get some help please?

Lynna [10]

The answer is 15. Just count the spaces between A and D.

3 0

2 years ago

2. Round off the following numbers to two decimal places:

Viktor [21]

Answer:

I think you mean significant figures

Step-by-step explanation:

46000
32000
560000
14000

6 0

2 years ago

11x to the 2 power= 8 what is the formula

LenKa [72]

Try downloading math papa I just did to get your answer

8 0

3 years ago