Answer:
a:d=7:9
Step-by-step explanation:
We have a system with 3 equation:

If we multiply all of these equations, then we have:

If we simplify this fraction dividing by 9, then:

Therefore, a:d=7:9
Answer:
28.5
Step-by-step explanation:
This is because each number increases by half of the previous number,
the difference between 10 and 18 is eight, which when halved is 4,
the difference between 18 and 24 is four, the pattern then carries on...
Hopefully you found this useful :)
Rounded off to the nearest full number, it would be 3 rounds but that wouldn't make sense because 3 x 10 is 30 sooooo the answer would be 3.5 meaning you paid 1 fifth the price of 10 rounds.
Answer:
1/2187 is the 10th answer in the sequence
Step-by-step explanation:
just keep dividing the number by 3
1/9, 1/27, 1/81, 1/243, 1/729, 1/2187