Sum of members

What is the sum of the first two members of the aritmetic progression if d = -4.3 and a3 = 7.5?

Correct answer:

s =  27.9

Step-by-step explanation:

d=4.3 a3=7.5 a2=a3d=7.5(4.3)=595=1145=11.8 a1=a2d=11.8(4.3)=16110=16110=16.1 s=a1+a2=16.1+11.8=27910=27910=27.9

We will be pleased if You send us any improvements to this math problem. Thank you!


You need to know the following knowledge to solve this word math problem:

Related math problems and questions:

  • The sum
    seq_sum The sum of the first 10 members of the arithmetic sequence is 120. What will be the sum if the difference is reduced by 2?
  • Difference AP
    delta Calculate the difference of arithmetic progression if the sum of its first 19 members Sn = 8075 and the first member is a1 = 20
  • Fifth member
    arithmet_seq Determine the fifth member of the arithmetic progression, if the sum of the second and fifth members equal to 73, and difference d = 7.
  • Finite arithmetic sequence
    seq_sum How many numbers should be inserted between the numbers 1 and 25 so that all numbers create a finite arithmetic sequence and that the sum of all members of this group is 117?
  • Sum of GP members
    exponentialFexsDecay Determine the sum of the GP 30, 6, 1.2, to 5 terms. What is the sum of all terms (to infinity)?
  • Three members GP
    exp_growth The sum of three numbers in GP (geometric progression) is 21 and the sum of their squares is 189. Find the numbers.
  • Series
    fib Your task is express the sum of the following arithmetic series for n = 14: S(n) = 11 + 13 + 15 + 17 + ... + 2n+9 + 2n+11
  • Sum of the seventeen numbers
    seq_sum The sum of the 17 different natural numbers is 154. Determine the sum of the two largest ones.
  • Geometric progression
    exp In geometric progression, a1 = 7, q = 5. Find the condition for n to sum first n members is: sn≤217.
  • Find the sum
    arithmet_seq Find the sum of all natural numbers from 1 and 100, which are divisible by 2 or 5
  • Sum 1-6
    seq_sum Find the sum of the geometric progression 3, 15, 75,… to six terms.
  • Three ints
    2016_hny The sum of three consecutive integers is 2016. What numbers are they?
  • GP - three members
    progression_ao The second and third of a geometric progression are 24 and 12(c+1), respectively, given that the sum of the first three terms of progression is 76. determine the value of c.
  • Sequence
    sunflower Between numbers 1 and 53 insert n members of the arithmetic sequence that its sum is 702.
  • Sequence 2
    seq2 Write the first 5 members of an arithmetic sequence a11=-14, d=-1
  • Consecutive numbers
    progression Sum of ten consecutive numbers is 105. Determine these numbers (write first and last).
  • Octahedron - sum
    8sten On each wall of a regular octahedron is written one of the numbers 1, 2, 3, 4, 5, 6, 7 and 8, wherein on different sides are different numbers. For each wall John make the sum of the numbers written of three adjacent walls. Thus got eight sums, which also