See https://web2.0calc.com/questions/help_29603.
The series of numbers is adding 5 and then subtracting 2
20+5=25
25-2=23
23+5=28
28-2=26
and so on. Do you understand?
(820*7)-(480*7)=? This is how to solve the equation
Answer: 88
Step-by-step explanation:
Given
The first row has 16 seats
then there are 3 more seats in each row
this follows an AP with the first term
and common difference 
So, no of seats in the 25 th row is

Thus, there are 88 seats in the 25 th row
Circumference: 6.28 feet ~rounded to the nearest hundredth
To find circumference, multiply the diameter by pi.
Area: 3.14 feet squared ~rounded to the nearest hundredth
To find area, divide the diameter by 2 and multiply by pi.