4 years ago

Help me with thw part a and part b also show ur work

Mathematics

1 answer:

Andrews [41]4 years ago

7 0

Part A : $25.50

Part B : $499.80

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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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4 years ago

SOMEONE HELP FOR 15 POINTS

zheka24 [161]

Answer:

Step-by-step explanation:

Hint:

a² - 9a + 15 = (a-7)(a-2)

a² + 9a + 15 = (a+7)(a+2)

a² + 3a - 10 = (a-2)(a+5)

a² + 5a - 14 = (a-2)(a+7)

a² - 5a - 14 = (a-7)(a+2)

7 0

3 years ago

What is the solution to the quadratic inequality? 8x2≥3+10x (−∞,−14]∪[32,∞) (−∞,−32]∪[14,∞) [−14,32] [−32,14]

Burka [1]

Answer:

umm

Step-by-step explanation:

im in 6th so i dont not know what that means sorry

7 0

4 years ago

in one year dog's weigh from 64 pounds to 80 pounds . by what percentage did the dog's weght increase

Masja [62]

Answer:

15%

Step-by-step explanation:

First, let's find how many pounds the dog's weight increased by during the year.

80 - 64 = 16

Now, knowing that the dog's weight increased by 16 pounds, we can use that to figure out the percentage of 16 out of 64 (divide them, then multiply by 100 to get a percentage).

$\frac{16}{64}$ • 100 = 0.25 • 100 = 25%

8 0

3 years ago

jose earns $3680 per month, of which 22% is taken out of his paycheck for federal and state income taxes and other required dedu

Anna007 [38]

30%

monthly earnings= $3680
22% of the earnings is
=22/100*3680
=0.22*3680
=$809.6
Jose's take home will be
3680-809.6
=$2870.4

5 0

3 years ago

Read 2 more answers