3 years ago

QUICK !!! FAST 15 POINTS I NEED HELP!!!!!

Mathematics

2 answers:

Firdavs [7]3 years ago

8 0

Answer:

ECB

Step-by-step explanation:

I noticed they looked exactly the same.

Lana71 [14]3 years ago

3 0

Answer:

It should be ΔABD, ΔECD, and ΔECD

Step-by-step explanation:

Since ΔABE is a right triangle, one angle must be 90° with a square to signify it.

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-10+16+(+10)-(-10)+5

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a video game has 35 levels in it if you beat 5 of the levels what is the ratio of levels left to the levels that have been beate

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7.<br> Which number line represents the solution to 2x + 3 < 5?

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Hoochie [10]

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4 years ago

Which expression is equivalent to 60 Σ n=1 (2n − 1)2 ? Check all that apply.

Hunter-Best [27]

9514 1404 393

Answer:

B, D

Step-by-step explanation:

The quadratic expands to ...

(2n -1)² = (2n)² +2(2n)(-1) +(-1)² = 4n² -4n +1

The coefficients can be factored out of the sum, so ...

∑(4n²) = 4∑n² for example

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$\displaystyle\sum_{n=1}^{60}{1}=1+1+1+\dots+1=60$

So, the sum can be written as ...

$\displaystyle\sum_{n=1}^{60}{(2n-1)^2}\\\\=\boxed{4\sum_{n=1}^{60}{n^2}-4\sum_{n=1}^{60}{n}+\sum_{n=1}^{60}{1}}\\\\=\boxed{4\sum_{n=1}^{60}{n^2}-4\sum_{n=1}^{60}{n}+60}$

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It appears that the key to choosing the correct answers is paying attention to signs.

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