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
sweet [91]
3 years ago
6

For an arithmetic sequence where a1 = 13 and the common difference is 3, find s7.

Mathematics
1 answer:
melamori03 [73]3 years ago
7 0

Answer:

Answer:

D ) 154

Step-by-step explanation:

a 1 = 13,  d = 3;

S n = n/2 * ( a 1 + a n )

a 7 = a 1 + 6 d = 13 + 3 * 6 = 13 + 18 = 31

S 7 = 7/2 * ( 13 + 31 ) = 7/2 * 44 = 154

You might be interested in
What is the area of a triangle with a height of 13 cm and a base of a 10 cm?
Alecsey [184]
Area of a triangle is equal to 1/2 b(h) so since you already have the height and base, all you need to do is input it back into the equation:

\frac{1}{2} (10)(13)


Multiply 10 & 13 to equal 

\frac{1}{2} (130)

Then take half of 130 to get

A = 65 cm^{2}
8 0
3 years ago
Read 2 more answers
Solve:<br><br> 3x-y= 4<br> 2x-3y =-9
slavikrds [6]
Put in 9x4x3x2=216     easy 2 solve but hard 2 find
4 0
4 years ago
PLEASE I NEED HELP QUICKLY!!
Savatey [412]

Answer:tiz x

Step-by-step explanation:

7 0
2 years ago
How many solutions does the equation<br><br> 4x - 2(-x + 6) = 3(2x - 4) have?
Veseljchak [2.6K]

Answer:

infinity (All real numbers are solutions)

Step-by-step explanation:

4x +2x -12 = 6x -12

6 x = 6x

6x - 6x =0

7 0
3 years ago
Graph this equation: y = 2x -3. Name another point on this line. *
kompoz [17]

Answer:

is x=\frac{y+3}{2}

Step-by-step explanation:

this work is very easy and no hard

3 0
3 years ago
Other questions:
  • A study found that 1/4 of the students surveyed are in a school sport or club. What must be true about the number of students in
    10·1 answer
  • What type of bar graph that display frequency of data
    13·1 answer
  • can someone help me with this? this is algebra 2 question and please show me all work (orderd pair, vertex, graph ect..)
    11·1 answer
  • What is cos 45°?
    9·1 answer
  • BRAINLIEST TO WHOEVER ANSWERS CORRECTLY FIRST!
    5·1 answer
  • 99 POINT QUESTION, PLUS BRAINLIEST!!!
    7·2 answers
  • Help<br><br> Thanks <br><br><br> Answer pleasw
    15·2 answers
  • What is the slope of the line passing through -4,6 and 3,-8
    14·2 answers
  • Helppppppp and I mark you
    15·1 answer
  • I need help what is 19-4.25
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!