1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ksivusya [100]
2 years ago
7

PLEASE HELP! 25 POINTS AND BRANLIEST!!!!!! Find the sum of the series. Include each term that leads to the final sum and show th

e expression for finding that term.
The 5 is above the sigma, while the k=3 is below.
Please show work!
∑5 k=3(−2k+5)
Mathematics
1 answer:
Makovka662 [10]2 years ago
7 0

Answer:

I think the answer is -9?

Step-by-step explanation:

5

∑ -2k + 5

k=3

= [-2(3) + 5] + [-2(4) + 5] + [-2(5) + 5]

=      -1 + -3 + -5

 = -9

You might be interested in
the area of a gymnasium floor is 264 square yard. the floor is 11 yards wide . how long is the floor?
Alekssandra [29.7K]
Area = Length x Width (A = L x W)

A = 264, W = 11, L = ?

Rewrite the equation to find L. In order to reverse multiplication, you must divide.

L = A / W

L = 264 / 11 = 24 yards
4 0
3 years ago
Read 2 more answers
Find a compact form for generating functions of the sequence 1, 8,27,... , k^3
pantera1 [17]

This sequence has generating function

F(x)=\displaystyle\sum_{k\ge0}k^3x^k

(if we include k=0 for a moment)

Recall that for |x|, we have

\displaystyle\frac1{1-x}=\sum_{k\ge0}x^k

Take the derivative to get

\displaystyle\frac1{(1-x)^2}=\sum_{k\ge0}kx^{k-1}=\frac1x\sum_{k\ge0}kx^k

\implies\dfrac x{(1-x)^2}=\displaystyle\sum_{k\ge0}kx^k

Take the derivative again:

\displaystyle\frac{(1-x)^2+2x(1-x)}{(1-x)^4}=\sum_{k\ge0}k^2x^{k-1}=\frac1x\sum_{k\ge0}k^2x^k

\implies\displaystyle\frac{x+x^2}{(1-x)^3}=\sum_{k\ge0}k^2x^k

Take the derivative one more time:

\displaystyle\frac{(1+2x)(1-x)^3+3(x+x^2)(1-x)^2}{(1-x)^6}=\sum_{k\ge0}k^3x^{k-1}=\frac1x\sum_{k\ge0}k^3x^k

\implies\displaystyle\frac{x+4x^3+x^3}{(1-x)^4}=\sum_{k\ge0}k^3x^k

so we have

\boxed{F(x)=\dfrac{x+4x^3+x^3}{(1-x)^4}}

5 0
3 years ago
4x/3 + 2(3- x) = 5 Solve for x as an FRACTION
forsale [732]

Answer:

<h2>The answer is .... <u><em> x = 3/2</em></u><em> </em>and if you want to write it as a mixed fraction i will be x= <u><em>1 and 1/2</em></u></h2>

Step-by-step explanation:

Hope this Helped :)

6 0
3 years ago
What is 15% of 90? a
Ratling [72]

Answer:

13.5

Step-by-step explanation:

8 0
2 years ago
Please help me please!<br> Also, please show your work image shown below in attachment
WINSTONCH [101]

Answer:

see below

Step-by-step explanation:

some of your answers that you currently have are wrong, I'll note those mistakes below

- when factoring (ie 5x+15) only factor out things that can divide both numbers into a whole number ratio

5x+15 = 5(x+3), not (x+3)(x+5)

ie  \frac{10x^2+20x}{x+2}

we see that 10x can divide the numerator in a whole number ratio

10x^2+20x = 10x(x+2), not (x+2)(x+10)

second mistake: the first binomial expansion is incorrect.

you have the expansion formula right, but you added terms wrong, go look at it again

3. x^2+3x+2/ x^2+5x+6

(x+1)(x+2)/(x+3)(x+2)

(x+1)/(x+3)

4. (x^2+6x+8)/(x^2-16)

(x+4)(x+2)/(x+4)(x-4)

(x+2)/(x-4)

5. we can't simplify that any more, x and y are different variables so therefore we cannot cross out stuff on numerator and denominator

6. (x^4y^6)^2

(x^4y^6)(x^4y^6) = x^8y^{12}

remember that (x^a)(x^b) = x^(a+b)

or remember that (x^a)^b = x^ab

6 0
3 years ago
Other questions:
  • Name a pair of perpendicular lines
    6·1 answer
  • How many solutions are there for the system of equations shown on the graph?
    11·2 answers
  • The table shows a golfers score for four rounds of a recent U.S. Women’s Open. Her total score was even with par. What was her s
    8·1 answer
  • 1. Justin divided 403 by a number and got a quotient of 26 with a remainder of 13. What was the
    11·2 answers
  • Hilary want to fill a mini cake pan with batter to make a mini cake for Philip's party. The cake pan is 4.0 inches long, 9.0 inc
    11·1 answer
  • Create an equation that represents a parabola that opens upward
    5·1 answer
  • What times 2 is -9? plz help
    10·1 answer
  • Charles offers 7% over dealer cost on a BMW that has a sticker price of $63,000 and a dealer cost of $56,904
    15·1 answer
  • #1 Identify the characteristics of the quadratic graph
    6·1 answer
  • A devastating freeze in California's Central Valley in January 2007 wiped out approximately 75% of the state's citrus crop. It t
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!