3 years ago

I really need this one answered, I just can’t figure it out.

1 answer:

4 0

25.2 divided by 4.2 =6

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Nataly [62]

Since there are only 4 terms in the sum, it's not too much work to expand it as

$\displaystyle \sum_{n=0}^3 (2n-3) = -3 + (-1) + 1 + 3 = \boxed{0}$

Alternatively, we can use the well-known formulas

$\displaystyle \sum_{n=1}^N 1 = \underbrace{1 + 1 + \cdots + 1}_{N \text{ 1s}} = N$

$\displaystyle \sum_{n=1}^N n = 1+2+\cdots+N = \frac{N(N+1)}2$

These sums start at n = 0, so in our given sum we will keep track of the 0-th term separately:

$\displaystyle \sum_{n=0}^3 (2n-3) = -3 + \sum_{n=1}^3 (2n-3) = -3 + 2 \sum_{n=1}^3 n - 3 \sum_{n=1}^3 1 = -3 + 3\times4 - 3\times3 = 0$

as expected.

8 0

2 years ago

Mamont248 [21]

3/2 is your answer now free points woo hoo

5 0

4 years ago

Semenov [28]

Lol bro I’m not shure skip the Addd

7 0

3 years ago

Lina20 [59]

Fractional form: 63/10 or 6 3/10.

8 0

3 years ago

saw5 [17]

449640 pieces of candy total. Wow, what a sweet treat

3 0

3 years ago