For this, simply find the width and length by finding the distance between the two points. This can be done using the equation 
AB(length): 
--> 
--->
= 6.32
BC(width): 
--> 
---> 
---->
= 5.29 ≈ 5.3
Area = 33.496 ≈ 33.5

n is an integer, so 2n+1 is also an integer. 8s+1 is equal to the square of 2n+1, so it's a square number.
2n+1 is an odd integer for any value of n. The square of an odd integer is always an odd integer. Therefore 8s+1=(2n+1)² is odd.
8s+1 is an odd square number.
6/3 because that fraction is equal to 2 and an integer is a whole number not a fraction.
53(1 + x)
the 53 is the cost of the meal without the tax
the x is gonna be the percentage of the tip u want to leave...in decimal form
so lets say u are going to leave a 5% tip.....5% = 0.05
ur equation would be 53(1 + 0.05) = 53(1.05) = 55.65...cost of meal and tip