# What is 10

What is the 5th term, if the 8th term is 80 and common ratio r =1/2?

### Correct answer:

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

## Related math problems and questions:

- Geometric progression

If the 6th term of a GP is 4 and the 10th is 4/81, find common ratio r. - The sum 21

The sum of the 2nd and 3rd term of a geometric progression is six times the 4th term . Find the two possible values of the common ratio B, If the second term is 8 and the common ratio is positive. Find the first 6 terms. - In a GP 72+144

In a GP the sum of the 2nd term and fifth term is 72 and the sum of the 3rd term and 6th term is 144. find the common ratio, find the first term, find the sum of the first six terms - Seventh term

The first term of a geometric sequence is 9 and the third term is 1296. Find the seventh term. - Find the 2

Find the term independent of x in the expansion of (4x^{3}+1/2x)^{8} - Five element

The geometric sequence is given by quotient q = 1/2 and the sum of the first six members S_{6}= 63. Find the fifth element a_{5}. - Determine 3876

Determine the second term and the quotient GP if a3 = 48.6 a1 + a2 = 6 - Geometric 61524

Determine the first term and quotient in the geometric sequence: a4 = -8 / 3; a6 = -32 / 3 - Determine 3755

Find the third term and the quotient GP if a2 = -3, a1 + a2 = -2.5 - Common difference

The 4th term of an arithmetic progression is 6. If the sum of the 8th and 9th terms is -72, find the common difference. - 15th term of AP

What is the 15th term; x1=1.5, d=4.5? - Arithmetic progression 2

The 3rd term of an Arithmetic progression is ten more than the first term, while the fifth term is 15 more than the second term. Find the sum of the 8th and 15th terms of the Arithmetic progression if the 7th term is seven times the first term. - Quotient

Determine the quotient and the second member of the geometric progression where a3=10, a1+a2=-1,6 a1-a2=2,4. - HP - harmonic progression

Determine the 8th term of the harmonic progression 2, 4/3, 1,… - GP - 8 items

Determine the first eight members of a geometric progression if a_{9}=512, q=2 - Sum of GP members

Determine the sum of the GP 30, 6, 1.2, to 5 terms. What is the sum of all terms (to infinity)? - Difference 3923

Determine the ninth term and the difference AP if a3 = 4.8 and a2 + a3 = 8.