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
The perimeter of a parallelogram is 60 meters. The width (W) of the parallelogram is 2 meters less than its length (L). Find the
PSYCHO15rus [73]
120 because 60 times two is 120 and six times two is twelve
4 0
3 years ago
What is the result when 4x3 + 4x² + 13x + 6 is divided by 2x + 1?
Nitella [24]

Answer:

2x^2+x+6

Step-by-step explanation:

if the 4x3 meant 4x^3, then im pretty sure this is the correct answer

3 0
4 years ago
What is the value of w?
sergeinik [125]

Answer:  Most likely, the value of w is 5 units.

Step-by-step explanation: P = 2L + 2w

If the perimeter is 28, the side lengths must be less than 14, otherwise there is no width, just two lines on top of one another.

If the width is 7, then all four sides would be 7 units, and <u>that would create a square</u>-- which is a type of rectangle-- but probably not what this question is about.

A width of 5 units makes sense, 2w would be 10, leaving 28-10 = 18 to be divided by 2 for lengths of 9

The rectangle would have a width of 5 units and a length of 9 units.

7 0
3 years ago
Solve the triangles below
nataly862011 [7]
I guess you want the missing angle.
The missing angle is 83

4 0
3 years ago
During a 35% off sale at the furniture store, you found a chair with the original price of $84.61. How much will the sale price
Dafna11 [192]

Answer:55$

Step-by-step explanation:84.61 x .35 = 29.61

84.61 - 29.61 = 55

7 0
4 years ago
Other questions:
  • Which of the following is NOT a lifestyle factor that affects physical fitness?
    12·2 answers
  • Simplify (4x-8)/(-3x)*(12)/(12-6x)
    14·1 answer
  • a fruit bar is 5 inches long. it is split into 2 pieces. if one piece is 3/10 of the whole bar, how long is the piece?
    12·1 answer
  • 8+4m=9m-7<br> check solution
    8·2 answers
  • What must be added to the expression below to make it a perfect square trinomial? *
    12·1 answer
  • -6n + 3= 45<br><br>how do solve this? I need help showing my work<br>​
    12·1 answer
  • Write the following sentence using mathematical symbols:
    8·2 answers
  • I need the find the area of a rectangle. the length is 6.5x + 5ft and the width is 15 ft
    7·1 answer
  • A=20<br> B=10<br> C=23<br> D=29.2
    7·1 answer
  • 3^-3 x 10^-3 what is the value?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!