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
olasank [31]
3 years ago
13

Can anyone explain to me what this is asking/how to do this? I think it's for the summation formula

et/?f=S_%7Bn%7D%20%3Dn%28%5Cfrac%7Ba_%7B1%7D%2Ba_%7Bn%7D%20%20%7D%7B2%7D%29" id="TexFormula1" title="S_{n} =n(\frac{a_{1}+a_{n} }{2})" alt="S_{n} =n(\frac{a_{1}+a_{n} }{2})" align="absmiddle" class="latex-formula"> but if I'm given a1, an, and n, what are the other numbers for?

Mathematics
1 answer:
disa [49]3 years ago
6 0

Answer:

D 3500

Step-by-step explanation:

This question is asking for the sum of all the terms in an arithmetic series.

So using the formula : Sn = n/2 (a+l) , where Sn is the sum of n terms, a is first term, and l is last term, we try to find Sn, with n being 25, a being 20, and an which is a25 or the twenty fifth term being 260, also being the last term.

Hence we can produce the formula for Sn which is Sn=25/2 (20+260)

Sn=25/2 (280)

=3500

You might be interested in
Square root:27 + SR:48+SQ:12 = ???
Anika [276]
Sqrt(27)+sqrt(48)+sqrt(12)
Sqrt(27)=sqrt(3*3*3)=3*sqrt(3)
Sqrt(48)=sqrt(4*4*3)=4*sqrt(3)
Sqrt(12)=sqrt(2*2*3)=2*sqrt(3)
Add the three to get 9*sqrt(3)
Final answer:
9*sqrt(3)
Hope I helped :)
5 0
3 years ago
Read 2 more answers
Gary wrote the comparison below.
scoray [572]

Answer:

what box?

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Find the surface area of the prisma
Llana [10]

Answer:

320 hope it helps :)

Step-by-step explanation:

5 0
3 years ago
What is the distance between the points R(5, 7) and S(-2, 3)?​
kondaur [170]

Answer:

Step-by-step explanation:

D

5 0
3 years ago
Mrs. Kemp had 20 students in her kindergarten class at the beginning of the year.
Kipish [7]

Answer:

15%

Step-by-step explanation:

23 is 115% of 20 therefore, we can know that 23 is a 15% increase from 20.

5 0
3 years ago
Read 2 more answers
Other questions:
  • 12(3w+8)=25 what is the w
    11·1 answer
  • Express the quantities below in a+bi form, and graph the corresponding points on the complex plane. If you use one set of axes,
    8·1 answer
  • △POQ~△ROS. Identify the coordinates of S and the scale factor. HELP ASAP!!
    13·1 answer
  • I don't understand this??
    6·1 answer
  • What is the unit rate in feet per second for 240 yards/ 1 hour
    12·1 answer
  • What is the square root of:<br><br>a) 58.82<br>b) 10
    14·1 answer
  • Karl needs to build a stage that has an area of 72 square feet. The length of the stage should be longer than the width. What ar
    10·1 answer
  • What is the slope of a line perpendicular to the line with equation y = 4x + 5?
    6·1 answer
  • I don't understand how to do this can someone help me with this problem? My mid-term is tomorrow and I want one less problem to
    11·1 answer
  • ANSWERS ASAP PLEASEEE
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!