#1 is Arithmetic with d = 5
It is NOT geometric
r = 29/24 = 1.208
r = 19/14 = 1.357
1.208 is NOT 1.357
Determine whether each sequence is arithmetric or geometric. Find the next three terms.
1.14, 19, 24, 29,...
geo, 34, 39, 44****
arithmetric, 32,36,41****
arithmetric, 34, 39, 44
The sequence is neither geo nor arith
2.-4,8,-16,32,...
arith, 64, 128, 256****
geo, -64, 128, -256****
geo, -48, 64, -80
The sequence is neither geo nor arith
3.81, 27, 9, 3,...
arith, 0, -3, -6
geo, 0, -3, -6****
geo, 1, 1/3, 1/9****
The sequence is neither geo nor arith
Find the next three terms in the sequence.
4. 3,12,21,30,...
40,50,60
38,46,54****
39,48,57
36,32,39****
5. 30,22,14,6
3,-12,-21****
-1,-8,-15
-1,-2,3
-2,-10,-18****
I PICKED 2 ANSWERS BECAUSE I THOUGHT THEY WERE BOTH RIGHT.
4 answers
2.
-4,8,-16,32,...
-4 to + 8 is +12
then it goes DOWN 12
so not arithmetic, different d
now is it geometric?
8/-4 = -2
-16/8 = -2
32/-16 = -2 = r SO GEOMETRIC
next term is
32 * -2 = -64
so the middle one.
I do not understand why you are having trouble with these.
-4,8,-16,32,...
-4 to + 8 is +12
then it goes DOWN 12
so not arithmetic, different d
now is it geometric?
8/-4 = -2
-16/8 = -2
32/-16 = -2 = r SO GEOMETRIC
next term is
32 * -2 = -64
so the middle one.
I do not understand why you are having trouble with these.
http://www.mathsisfun.com/algebra/sequences-sums-geometric.html
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
25 answers