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
erastovalidia [21]
2 years ago
11

For each of the summations given below, use the formula for the sum of the first n integers either to evaluate the sum or to exp

ress it in closed form. (a) 9 + 10 + 11 + 12 + ... + 700 (b) 9 + 10 + 11 + 12 + ... +k
Mathematics
1 answer:
yarga [219]2 years ago
5 0

The answers are

a) 245314

b) (k2 + k- 72)/2

a)

Let F(n) denotes the sum of first n natural numbers.

F(n) = (n(n+1))/2

9+10+11+12+13+----------------------+700

F(700) - F(8) = (700*701)/2 - (8*9)/2 = 490628/2 = 245314

b)

9+10+11+-------------------k

F(k) - F(8) = (k(k+1))/2 - (8*9)/2 = (k2 + k- 72)/2

Natural numbers are all positive numbers like 1, 2, 3, 4, and so on. They are the numbers you usually count and they continue till infinity.

Learn more about natural numbers here: brainly.com/question/24672369

#SPJ4

You might be interested in
If 2x-6=0 the x =? ​
Oliga [24]

Answer:

x=3

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Suppose you draw a card from a​ well-shuffled deck of 52 cards. What is the probability of drawing a 5 or a queen?
goldfiish [28.3K]
A 5 or a queen

52 cards per deck
each card repeats 4 times

a 5 or a queen
there are four 5's and four queens
4+4=8

probablity=desiredoutcomes/totalpossible
probablity=8/52
probablity=4/26
probablity=2/13
5 0
3 years ago
What is the area of this composite shape? Enter your answer in the box. In².
vladimir2022 [97]

The area of the composite shape is the sum of the area of the triangle and the area of the rectangle. The area of the composite shape is 53 in².

<h3>What is Geometry?</h3>

It deals with the size of geometry, region, and density of the different forms both 2D and 3D.

The composite is made up of triangles and rectangles.

The area of the composite shape will be the sum of the area of the triangle and the area of the rectangle.

The area of the triangle will be

\rm  Area\ of\ the\ triangle = \dfrac{1}{2} * 5 * 2\\\\Area\ of\ the\ triangle = 5

The area of the rectangle will be

\rm  Area\ of\ the\ rectangle= 8*6\\\\Area\ of\ the\ rectangle = 48

The area of the composite shape is 48 + 5 = 53.

The area of the composite shape is 53 in².

More about the geometry link is given below.

brainly.com/question/7558603

4 0
3 years ago
5 units down and 4 units right
JulsSmile [24]

Answer: (4, -5)

Step-by-step explanation:

o(4, -5) is the answer because if you are going units down from the orgin  of (0,0) you would end with a negative 5 and going right 4 units from orgin, you'll end up with a 4.  

8 0
2 years ago
Read 2 more answers
Find the rate if the principal is $900, the time is 3 years, and the interest is $135. A)   5% B)   7.5% C)   15% D)   20%
Rus_ich [418]
The answer would be A) 5%. You can solve this by dividing 135$ by three years to get 45. then divide 45 by 900 to get 0.05 which is 5% in decimal form.
3 0
3 years ago
Other questions:
  • What are two lines in the same plane that intersect at right angles?
    6·2 answers
  • Apply the distributive property to rewrite 3(2-b).
    9·1 answer
  • 5.02 kg= ? A.502 g B.50.2 g C. 0.502 g D. 5,020 g
    9·2 answers
  • 66 times 26 times 60 then multiply 1/2
    11·2 answers
  • One rainy Saturday morning, Adam woke up to hear his mom complaining about the house being dirty. "Mom is always grouchy when it
    10·1 answer
  • Kasie likes to jog every morning before work. She can jog 3 miles in 30 minutes, if she
    14·2 answers
  • Alex wrote the equation y = 2x + 3 to describe a tile pattern. Use his equation to complete the table. how would you graph it​
    5·1 answer
  • You basically look at the bar graph on the right and see which statement is true. Brainliest and thank you!
    15·1 answer
  • Washington elementary has 4,358 students Jefferson high school has 3 times as many students as Washington elementary about how m
    12·1 answer
  • Scrivi le equazioni delle rette passanti per A (0; 9) e tangenti alla parabola di equazione y = 3x^2 - 4x + 12
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!