nakworm01
nakworm01
15-04-2015
Mathematics
Answered
Find sum of -3,2,7,12....,132
Arithmetic series
Answer :
naǫ
naǫ
16-04-2015
[tex]a_1=-3 \\ d=2-(-3)=5 \\ a_n=132 \\ \\ a_n=a_1+d(n-1) \\ 132=-3+5(n-1) \\ 132=-3+5n-5 \\ 132=-8+5n \\ 140=5n \\ n=28 \\ \\ S_n=\frac{n(a_1+a_n)}{2} \\ S_{28}=\frac{28(-3+132)}{2}=\frac{28 \times129}{2}=14 \times 129=1806[/tex]
The sum is
1806.
Answer Link
VIEW ALL ANSWERS ( 84+ )
Other Questions
A health club charges $35 a month for membership fees. Determine whether the cost of membership is proportional to the number of months. Explain your reasoning.
Why was the Nile River and the land around it ideal for settlement and civilization
Please write the explanation thanks
is berkelium flammable
Suppose that a 10-Mbps wireless station is transmitting 50-byte frames one immediately after the other. i) How many frames is it transmitting per second? ii
Use each pair of vocabulary words in a single sentence. I don't know how to
In "Jason and the Golden Fleece," which best describes Jason when he first arrives in the kingdom ruled by Pelias the terrible? A. content B. nervous C. con
Tony spent $60.54 and bought 3 packs of notebooks and a calculator. How much does a pack of notebooks cost if a calculator costs $45.87?
line AB contains points (2,1) and (-1,-8). what is the equation of the line parallel to line AB that contains point (0,2)?
im not sure of how to solve these,any help? : 2x-5>x-2
