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3 years ago

What is the sum of the series 18 E n=4 (n+1) ^2? 1,239 2,415 2,440 2,469

Mathematics

2 answers:

Akimi4 [234]3 years ago

8 0

Answer:

Step-by-step explanation:

hope it helps u too

Leto [7]3 years ago

5 0

9514 1404 393

Answer:

Step-by-step explanation:

The sum of the squares of numbers 1 .. n is ...

s(n) = n(n +1)(2n +1)/6

You want the sum of squares from 5 to 19. We can compute that from ...

s(19) -s(4) = (19(20)(39) -4(5)(9))/6 = (14820 -180)/6 = 2440

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Determine the side length.

White raven [17]

Answer:

Step-by-step explanation:

The given shape is a right angled triangle.

Here,

Hypotenuse = 2√3

Another side = √3

Let the missing side length be " x ".

By Hypotenuse theorem,

x² + ( √3 )² = ( 2√3 )²

x² + 3 = 12

x² = 12 - 3

x² = 9

x² = 3²

x = 3

Therefore, the side length is 3.

8 0

2 years ago

Are these perfect squares 36 and 25

raketka [301]

Yes they are! The square root of 36 is 6 and the square root of 25 is 5.

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3 years ago

Im learning about Recursive and Explicit in Pre-Calc, and it says to use the rule to write the first three terms of each sequenc

Tems11 [23]

Hello,

4. you have sequences defined by the first term and a recursive relation.

$a_1=3\\\\a_n=2a_{n-1} \ \ \text{ for n}> 1$

Take n = 2, it gives

$a_2=2a_1$ , right?

But you know $a_1=3$

so $a_2=2a_1=2*3=6$

This is the second term. You are asked to find the first three terms.

Now, let's take n = 3

$a_3=2a_2=2*6=12$

So the first three terms are 3, 6, 12.

$a_1=12\\\\a_2=\dfrac{1}{2}a_1+1=\dfrac{12}{2}+1=6+1=7 \\ \\a_3=\dfrac{1}{2}a_2+1=\dfrac{7}{2}+1=\dfrac{9}{2}$

$a_1=10\\ \\a_2=-3a_1=-3*10=-30\\\\a_3=-3a_2=-3*(-30)=90$

10.

$a_1=2\\\\a_2=-1\\\\a_3=a_2+a_1=-1+2=1\\\\a_4=a_3+a_2=1-1=0$

Do not hesitate if you have any question.

Thank you

8 0

4 years ago

Which expression has the same value as -18-(-9)? 0 - 18+2 -12-(-3) - 1945 O-8-(-4)

olganol [36]

Answer:

the answer is -12-(-3)

Step-by-step explanation:

8 0

3 years ago

Please help me on homework. I need help on questions A, E, H, and I...

alisha [4.7K]

Answer:a, 2^3, e, 2^6 h, 2^4

Step-by-step explanation:

2x2x2=8 and 2+2+2+2=8

5 0

3 years ago

Read 2 more answers