aguzman aguzman
  • 03-07-2015
  • Mathematics
contestada

the sum of the first 30 terms of the sequence an=6n+5 is

Respuesta :

kimeto3
kimeto3 kimeto3
  • 03-07-2015
Sum= n(a₁+an)/2 where a₁ is the first term, and an is the nth term(30th for this)
an= 6n+5
a₁=6(1)+5
   =11
a₃₀=6(30)+5
     =185
Sum= 30(11+185)/2
       =15(196)
       =2940
Answer Link

Otras preguntas

Miranda enlarged a picture twice as shown below, each time using a scale factor of 3. A rectangle with length 6 inches and width 4 inches is enlarged twice. Whi
What is the sum of -2x^2-5x+3 and 4x^2+4x-6
Figure ABCD is reflected across the y-axis. H What are the coordinates of A', B', and D'? Enter your answer in each box.
What did knights receive in exchange for their pledge of loyalty to a lord? A. a weapon C. an income B. a fief D. a title
These are receptors who function like other receptors in their receptors have ______ that change shape giving infor to the brain.
The dot plot below shows the minutes on the treadmill in the gym. What is the range of the data set? 10 20 30 40 50 60 70 80
Help me plzzzzzzzzzzzz
name this please for me lol
One of the angles of a regular dodecagon is 150°. What is the sum of the measures of all the interior angles of this dodecagon? A. 930° B. 1240° C. 1500°
New Homes has a bond issue with a coupon rate of 5.5 percent that matures in 8.5 years. The bonds have a par value of $1,000 and a market price of $1,022. Inter