good morning,
Answer:
10×(1-0.2ⁿ)
Step-by-step explanation:
1.6/8=0.2
0.32/1.6=0.2
0.064/0.32=0.2
let S represent the sum of n term then S=8×[(1-0.2ⁿ)/(1-0.2)] = 10×(1-0.2ⁿ).
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For this case we have that the complete question is:
There were 20 drinks in a cooler. Joey drank 15% of the drinks. Sandra drank 1/5 of the drinks. Hannah drank 1/4 of the drinks. Tammy drank 30% of the drinks. How many drinks are left in the cooler? a 0 b 2 c 5 d 9
We propose a rule of three:
20 ---------> 100%
x ------------> 15%
Where the variable "x" represents the amount of drinks equivalent to 15%.

So, Joey drank 3 drinks.
On the other hand, we have that Sandra drank
of the drinks:

Thus, Sandra drank 4 drinks.
In addition, Hannah drank
of the drinks:

So Hannah drank 5 drinks.
Finally, Tammy drank 30% of the drinks:
20 ---------> 100%
y ------------> 30%
Where the variable "y" represents the amount of drinks equivalent to 30%.

So Tammy drank 6 drinks.
Adding up we have:

So: 
Thus, 2 drinks remain in the refrigerator.
Answer:
Option B
Answer:
13) 1,11 14) 1,2,11,22 15) 1, 2, 4, 7, 14, 28 16) 1, 2, 4, 8, 16, 32 17) 1, 2, 3, 6, 7, 14, 21, 42
Step-by-step explanation:
Answer:
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