Step-by-step explanation:
area of square = 1
area of a circle in square =
bu estimate
b) if n tend to infinity

Everything should be capitalized. If "dear" is the beginning of a sentence, it should be capitalized. "aunt" and "mary" are a name so they should be capitalized too.
Berro can get 3 gallons of gas
(-23,-11) is the other endpoint due to (a+b/2)