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
wel
3 years ago
6

S=n/2(2a+(n-1)d). If d=5, n=13, S=585 find the value of a.​

Mathematics
1 answer:
anygoal [31]3 years ago
7 0

Answer:

15

Step-by-step explanation:

Sum of 'n' terms formula is given by:-    

s=n/2(2a+(n-1)d)  

s=13/2[2xa+(13-1)5]    

s=13/2(2xa+12x5)    

s=13/2(2a+60)    

585=13/2(2a+60)    

585 x (2/13) = 2a + 60

90 = 2a + 60  

90-60 = 2a

30 = 2a

a = 15

You might be interested in
During a math game, a team kept track of their answers. The following diagram describes the number of answers they got right to
juin [17]
Where’s the diagram ?
8 0
3 years ago
Read 2 more answers
kittens weigh about 100 grams when born and gain 7 to 15 grams per day. If a kitten weighs 100 grams at birth and gained 8 grams
scoray [572]
After 25 days. 300=triple 100+8x=300. is that 20 words?
8 0
4 years ago
Natasha watched 1/3 of a movie in the morning, and she watched some more at night. By the end of the day, she still had 2/5 of t
PtichkaEL [24]

Answer:

While slavery was the major issue separating the North and South, it was not slavery itself that sparked the conflict. The South wanted to secede from the Union, and the North refused. While President Abraham Lincoln personally opposed slavery, he recognized that it was legal under the U.S. Constitution at the time. He also recognized that few in the North were ready to go to war to free the slaves. For Lincoln and the northern majority, preservation of the Union was the foremost goal.

Step-by-step explanation:

While slavery was the major issue separating the North and South, it was not slavery itself that sparked the conflict. The South wanted to secede from the Union, and the North refused. While President Abraham Lincoln personally opposed slavery, he recognized that it was legal under the U.S. Constitution at the time. He also recognized that few in the North were ready to go to war to free the slaves. For Lincoln and the northern majority, preservation of the Union was the foremost goal.

5 0
2 years ago
Read 2 more answers
What is the 8th term in the sequence?<br><br><br> an=25−3n<br><br><br> Enter your answer in the box.
sergey [27]
The 8th term is of the sequence is1.
7 0
3 years ago
Read 2 more answers
Can anybody help me on all three plz it's due tm ??!!!!
solong [7]
4.5, 200, 60% are the answers you need.
6 0
4 years ago
Other questions:
  • Kris has fifteen 1 1/2 inch blocks. If they were stacked one on top of another in a single stack. How tall would the stack be ?
    14·1 answer
  • How would i find y i need helppp
    15·1 answer
  • This is a multiple choice question. Not sure how to solve, mainly because my textbook confuses me. Would appreciate help!!
    6·1 answer
  • Is 20% equivalent to 1/5
    9·2 answers
  • What is the absolute value of 3
    6·1 answer
  • Find the amount of money in an account after 9 years if $8,000 is
    5·1 answer
  • What is the radian measure of an angle equal to 225 ? ​
    14·1 answer
  • Which of the following is a coterminal angle of 138°? A.) 438° B.)-136° C.) -582° D.) 228°
    14·2 answers
  • PLEASE HELP!!!!
    13·1 answer
  • Help pls ill give extra points
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!