3 years ago

PLEAZE HELPPPPP

Mathematics

1 answer:

ankoles [38]3 years ago

4 0

Anwser has to be A hope im helping

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Find a closed form for Sn = 1 *1!+2*2!+...+n*n! for integer n>=1 Your response should have a factorial.

pantera1 [17]

Hello,

$x_{1} =1*1!=1\\
 x_{2} =2*2!=4\\
 x_{3} =3*3!=18\\
 x_{4} =4*4!=96\\

 S_{1} = x_{1}=1=2!-1\\
 S_{2} = x_{1}+x_{2}=1+4=5=3!-1\\
 S_{3} = x_{1}+x_{2}+x_{3}=5+18=23=4!-1\\
 S_{4} = x_{1}+x_{2}+x_{3}+x_{4}=23+96=119=5!-1\\

 \boxed{S_{n} = (n+1)!-1}\\


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6 0

4 years ago

Determine the value of a in the figure shown

galina1969 [7]

Answer:

Step-by-step explanation:

180-149= 31.

31+ 122= 153

180-153= 27

a= 27

3 0

3 years ago

Factor completely 64^2 - 1

Firlakuza [10]

Answer:

4095

Step-by-step explanation:

7 0

3 years ago

Is AB parallel to CD?

Katen [24]

You have to evaluate the slopes of these lines. For line AB you have a slope of
$\frac{1 - ( - 3)}{0 - ( - 3)} = \frac{4}{3}$
For line CD you have a slope of
$\frac{ - 1 - ( - 5)}{3 - 0} = \frac{4}{3}$
Because the slopes are equal and the two lines are not one and the same, they are parallel.

6 0

3 years ago

5 × -92 = <br> Just a quick response on how to solve this, thanks a ton!

Colt1911 [192]

Answer:

-460

Step-by-step explanation:

I multiply by splitting the numbers into digits. So for the 90, in my head I did 5 × 90, which is 450. Then I did 2 × 5, this is 10. Now I added those up to make 460. Considering the 92 is negative, the answer will also be negative.

8 0

4 years ago

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