This is a geometric series with first term 2 and common ratio -4. The general term of such a series (an) in terms of the first term (a1) and common rato (r) is written as
an = a1*r^(n-1)
The sum is the sum of such terms.
Ummm let me see so what u have to do is
Step-by-step explanation:
answer is in the image above
The expression 1.18p can be used to find the total cost of the meal with gratuity.
Step-by-step explanation:
Step 1:
If there are more than 6 people, the restaurant charges an automatic gratuity of 18%.
Since there are 8 people this charge will also be applied here.
If the bill amount is p and 18% of p is added, the options 0.18p and 0.82p cannot be the total cost of the meal.
Step 2:
We need to determine how much 18% is in terms of p.
18% of p 
So the total cost of the meal = Cost of the meal + Gratuity charges 
So the total cost is the third option 1.18p.