1. A geometric sequence has a common ratio. You can find the ratio by dividing every number by its previous one. If it is consistent, then the series is geometric.
a: 8/1=8, 27/8=3.375
b: (-3/2)/3=-1/2, (3/4)/(-3/2)=-1/2
c. 7/4=1.75, 10/7=1.429
d. 20/25=0.8, 14/20=0.7
Choice b is the only one that has a common ratio, so it is a geometric series.
2. Every term is multiplied by 1/3, so the common ratio is 1/3. d is the answer.
Answer: i have a answer but it is not up there srry
Step-by-step explanation:
It would be 3 dollars 9/3=3
ANSWER
250g of Roquefort cheese will cost
£2.8
EXPLANATION
If 150g of roquefort cheese cost £1.68, we can write the ratio,
Let 250g of Roquefort cheese cost £x.
Then we can again write the ratio,
We can equate the two ratios and solve for x.
We rewrite the ratios as fractions to obtain,
We cross multiply to get,
This implies that,
Divide both sides by 150 to get,
Therefore 250g of Roquefort cheese will cost
£2.8