this is gp because
because ratio of next term to previous term is always same.
8/16= 4/8 = 1/2
so common ratio is 1/2
first term is a = 16
so nth term of a gp is given as
Tn = ar^(n-1)
T10 = 16 × (1/2)^(10-1)
= 16 × (1/2)^9 = 1/32
Without knowing anything about the sequence, this is impossible to answer. But suppose the sequence is arithmetic, in which case each term differs by some constant 
:
Then we can write
and from the formula above, we see this means the 10th term in the sequence is 
. But that's all the specific info we can gather about such an arithmetic sequence. If we set the first term to be some unknown 
, then the sum of the first 19 terms in the sequence would be
If we knew one more term in the sequence, we could determine the value of and derive the value of 
(if the first term 
is not immediately given), and then go on to find an exact numeric value for the sum.
The answer is 43 hope this helps:)
Cool, but we need more information...
If you would like to know how many dolls did Bob and Carol break today, you can calculate this using the following steps:
On average, they break: 12% of 175 = 12/100 * 175 = 21 dolls.
Today: 2/3 as many dolls as usual = 2/3 * 21 = 14 dolls
Result: Bob and Carol broke 14 dolls today.
