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
Nutka1998 [239]
3 years ago
8

Find the sum. Homework: 9.4 arithmetic series

Mathematics
1 answer:
RUDIKE [14]3 years ago
5 0

Answer:

Step-by-step explanation:

a1 = 3(1) - 7 = - 4

a2 = 3(2) - 7 = -1

d = a2 - a1

d = -1 - (-4)

d = -1 + 4

d = 3

a60 = 3(60) - 7

a60 = 180 - 7

a60 = 173

n = 60

Sum = (a1 + a60) * n / 2

Sum = (-4 + 173) * 60/2

Sum = (169)*30

Sum = 5070

==================

Just to check, we'll use the second summation formula

d = 3

n = 60

a1 = -4

Sum = (2*a1 + (n - 1)*d )*n / 2

Sum = (2*(-4) + (60 -1)*3)* 60/2

Sum = (-8 + 59*3) * 30

Sum = (177 - 8)*30

Sum = 169 * 30

Sum = 5070

Same answer.

You might be interested in
Is an angle that is greater than 90 degrees is acute True or False
Brilliant_brown [7]
Hey there!

The answer is false. A 90 degree angle is called a right triangle. Any angle less than 90 degree is called an acute angle. Any angle more than 90 degree is called an obtuse angle
7 0
3 years ago
Read 2 more answers
. How do these two processes, finding the expected value of a discrete random variable and finding the dot product
kozerog [31]

Answer:

We can conclude that on this case we have identical processes but excersise 17 use another way to present the probability distribution and as we can see the expected value can be viewed as a dot product of two vectors with one vector containing the outcomes and the other the probabilities for each possible outcome.

Step-by-step explanation:

Assuming this previous info:

Exercise 17. Suppose that we convert the table on the previous page displaying the discrete distribution for the number of heads  occurring when two coins are flipped to two vectors.

Let vector

6 0
3 years ago
Colin gets £xx wages each week. After he pays his tax of £tt, he then pays his rent of £250. He shares what's left between himse
Levart [38]

9514 1404 393

Answer:

  (x -t -250)/2

Step-by-step explanation:

The amount left from x after paying t and 250 is ...

  x -t -250

If this is split into two equal parts, each share is ...

  share = (x -t -250)/2

5 0
3 years ago
Juan ramirez sells suits in a major department store on weekends he Ernst a commission of 5 percent on the first ten suits and h
romanna [79]

Answer:

$185

Step-by-step explanation:

The first ten suits sold for 10×$250 = $2,500

commission = 5% of $2,500 = 0.05×$2,500 = $125

The next three suits sold for 3×$250 = $750

commission = 8% of $750 = 0.08×$750 = $60

Total commissions = $125+$60 = $185

There are several errors in the question. If you are using voice recognition, you are better off typing the question manually.

5 0
3 years ago
Please help me i need a good grade
DedPeter [7]

Answer:

Step-by-step explanation:

midline: y = -2 (take the average of the min and max)

amplitude = 1.5 (distance from min or max to midline. Always a positive number)

period = 4pi

4 0
3 years ago
Read 2 more answers
Other questions:
  • Are the set of all square numbers under 50 and the set of all triangular numbers that are less than 50 disjoint?
    8·1 answer
  • The domain of the following relation: R: {(3, 5), (8, 6), (2, 1), (8, 6)} is
    10·2 answers
  • Use the formula you learned to answer the question. If a dogsled team travels 4 kilometers in 8 minutes, what is the speed of th
    10·1 answer
  • Find the area of the shaded regions. Give your answer as a completely simplified
    6·1 answer
  • The Punnett square below shows the cross between two parents heterozygous for two traits. In horses, the allele for black color
    5·1 answer
  • Select ALL of the lines that contain the point (1,6)
    9·1 answer
  • Let $$\mathbf { u } , \mathbf { v } , \text { and } \mathbf { w }$$ be vectors. Which of the following make sense, and which do
    14·1 answer
  • What is x, the distance between points A and A'? 2. 4 units 4. 8 units 13. 6 units 14. 4 units.
    14·2 answers
  • Which answer choice is an expression that represents the amount of money Kelly has left, if she started with 75 dollars and the
    15·2 answers
  • Can you please help me with this?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!