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
Zohar is using scissors to cut a rectangle with a length of 5x – 2 and a width of 3x + 1 out of a larger piece of paper. The per
Tresset [83]
62 is the answer, 2(5(4)-2)+2(3(4)+1)=62
8 0
3 years ago
Read 2 more answers
PLEASEEE HELP ASAP ITS IMPORTANT !!!!
Orlov [11]

Answer:

The rate of change in the table is 78 students per year

Step-by-step explanation:

Here, we want to get the rate of change of the function

Mathematically, we can get this by using the formula;

m = (y2-y1)/(x2-x1)

(x1,y1) and (x2,y2) are points we are to select from the table

Let us select the point (4,704) and (17,1718) from the table

The slope is thus;

m = (1718-704)/(17-4) = 78 students per year

8 0
4 years ago
Please help me quick​
OLga [1]

Answer:

Try B. 264 square feet

Step-by-step explanation:

8 0
3 years ago
Please answer...it's due soon, it's 50 points..! The first table shows the measures of variability for finish times of 30 runner
r-ruslan [8.4K]

Answer:

the answer is Letter B because I had this problem on a test before and it was B

Step-by-step explanation:

7 0
4 years ago
Simplify 49 to the negative 1 half power . (1 point)
tangare [24]
Anything to a negative power makes it inverse and 1/2 power is just square root.
Therefore 49^-1/2 is 1 divided by the square root of 49. The square root of 49 is 7 so the answer is 1/7.
7 0
3 years ago
Read 2 more answers
Other questions:
  • how do i find the volume of a prism rhat has a 6cm base and a 5.8cm height and a 4.5cm width needs work
    13·1 answer
  • A plane flies with an average velocity of -98.5 m/s for 45.0s. what was it's displacement?
    8·1 answer
  • 5. What number does the model below best represent?
    14·1 answer
  • Francesca spent 25 minutes on the internet yesterday if this is 5/6 of the time she spent on the computer,how long did she spend
    5·1 answer
  • PLEASE HELP ME!I have a really hard time with algebra 2 and I really need to pass:(
    6·1 answer
  • Jane is a better tennis player than jack. if the probability that jane will beat jack in any given game is 0.7, what is the prob
    8·1 answer
  • -25+-(-5)+13 what is the answers
    9·2 answers
  • PLZ HELP ME, ASAP I WILL CROWN BRAINLIEST!!!!
    13·1 answer
  • Divide y^7/y^5. Write the quotient as one power. The variable is not equal to zero.
    11·1 answer
  • What is 3+3 because math is really hard for me and I and slow
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!