Find s(25) for the sequence s(n) = 6n-4, n = 1,2,3....)
A) 142
B) 154
C) 150
D) 146
Find a(n) of an arithmetic progression if the first term is 5 and the common difference is 0.2
A) a(n)= 4.8 + 0.2n
B) a(n)= 5.2 - 0.2n
C) a(n)= 5.2+ 0.2n
D) a(n)= 5.0+ 0.2n
Find a(n) of an arithmetic progression if the first term is 8 and the common difference is -0.4
A) a(n)= 8.0 - 0.4n
B) a(n)= 7.6 +0.4n
C) a(n)= 7.6 - 0.4n
D) a(n)= 8.4 - 0.4n
Find the sequence that corresponds to the function a(n) = 5n-1, n= 1,2,3....
A) 4,9,14,19....
B) 9,14,19,24....
C) 4,8,12,16....
D) 6,11,16,21...
Find the first term and common difference for the sequence with the given nth term
a(n) = 6.4 + 0.6n
A) 6.4; 7.6
B) -7; 7.6
C) 7; 0.6
D) 6.4; 0.6
Find the first term and common difference for the sequence with the given nth term
a(n) 3.6 + 0.4
A) 3.6; 4.4
B) -4;4.4
C) 3.6; 0.4
D) 4; 0.4
Find s(14) for the sequence s(n)= 3n-2, n= 1,2,3....
A) 44
B) 38
C) 40
D) 42
Answer any that you can! Thank you so much. Algebra is just so difficult to me:/
Answers & Comments
Verified answer
1) s(25) = 6(25) - 4
= 150 - 4
= 146 (a)
2) AP = a + (n-1)d -----equ. 1
so a = 5, d = 0.2
= 5 + (0.2n - 0.2)
= 5 + 0.2n - 0.2
= 4.8 + 0.2n (a)
3) a = 8, d = -0.4
so, 8 + (n - 1)-0.4
= 8 + (-0.4n + 1.4)
= 9.4 - 0.4n (which is meant to be d, but dunno)
4) (a) = 4, 9, 14.
5) (c) = 7 ; 0.6
6) (d) = 4; 0.4
7) (c) = 40