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
SIZIF [17.4K]
3 years ago
6

Find the sum of this problemOptions:52 26 13 32

Mathematics
1 answer:
Ad libitum [116K]3 years ago
4 0
\displaystyle\sum_{i=3}^{10}(2i-9)=2\sum_{i=3}^{10}i-9\sum_{i=3}^{10}1
\displaystyle=2\left(\sum_{i=1}^{10}i-\sum_{i=1}^2i\right)-9\left(\sum_{i=1}^{10}-\sum_{i=1}^21\right)

Recall that

\displaystyle\sum_{i=1}^ni=\frac{n(n+1)}2
\displaystyle\sum_{i=1}^n1=n

so the above reduces to

2\left(\dfrac{10\cdot11}2-\dfrac{2\cdot3}2\right)-9\left(10-2\right)=32

You might be interested in
40 POINTS!! AND BRAINLIEST!! The equation of the line is Y=2.x- 1.8. Based on the graph which of the following are true?
nalin [4]

Answer:

The correct statment is B.

Step-by-step explanation:

A. is not correct:  y = 2.4(30) - 1.8 does not equal 70...

<u>B. Is correct because the slope is 2.4 From the equation</u>

C. is not correct because the points have no 2.4 (maybe 2.2)? difference.

D. is not correct. the correlation isn't positive.

7 0
3 years ago
The prefix octa-means what?
yuradex [85]
The prefix means 8.How to remember this is a octagon which has 8 sides.Therefore Octa means eight.I hope this helped.
3 0
2 years ago
Read 2 more answers
Someone pls help me with this im new thats why tysm if you do help!!:)
Kipish [7]

Answer:

-8 hope this helps

Step-by-step explanation:

7 0
3 years ago
Solve the formula <br> x − y = −8 for y.
laiz [17]

Answer:

y = x + 8

Step-by-step explanation:

x - y =  - 8

x + 8 = y

4 0
3 years ago
Whats the way to do 3+x&lt;7
Shkiper50 [21]
Try 3+x which would be 4 and 7 is greater then 4 because x by its self or and other variable is 1. hope this helped!

7 0
3 years ago
Other questions:
  • Suling bought 3meters of ribbons she used 5/6meter to make a bow find the length of the ribbon left
    13·1 answer
  • Can someone plz help ☹️☹️☹️
    11·1 answer
  • Sophia is buying party favors.she has a budget of $2.75 a person for 6 people.how much can Sophia send on the party favors?
    5·1 answer
  • T(t)T, models the daily high temperature (in Celsius) in Santiago, Chile, t days after the hottest day of the year. Here, t is e
    7·1 answer
  • PlEAssE HeLPLL!!!!! LIKE REALLY HELP ME!!
    10·2 answers
  • The ninth graders are hosting the next school dance. They would like to make at least a $500 profit from selling tickets. The ni
    14·1 answer
  • Out of the 30 days in April, 3/5 of the days were sunny and clear. The rest of the days were either cloudy or contained some rai
    9·1 answer
  • Solve the equation (-8x-58)= (-2x+35)
    13·2 answers
  • 12. Find the surface area of each figure to the nearest tenth.
    13·1 answer
  • A bodybuilder gains 1.5 pounds each week for 5 weeks. Which equation represents the change in the bodybuilder's weight after the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!