Answer:
A = Ph + 2B
Step-by-step explanation:
where P is perimeter of the base, h is height of the prism (this is the rectangular lateral surface area) and B is the area of the base
Pain au chocolat dur main
Answer:
16 square feet
Step-by-step explanation:
The apothem of a square is equal to half of the length of one side.
This means that twice the apothem is equal to the length of one side.
2*2 = 4 ft
To get the area I will multiply the two sides (squares have equal sides):
4*4 = 16 ft^2
That answer was (B)................
(a) 
since 13 is prime.
(b) 
, and there are 81/3 = 27 multiples of 3 between 1 and 81, which leaves 81 - 27 = 54 numbers between 1 and 81 that are coprime to 81, so 
.
(c) 
; there are 50 multiples of 2, and 20 multiples of 5, between 1 and 100; 10 of these are counted twice (the multiples of 2*5=10), so a total of 50 + 20 - 10 = 60 distinct numbers not coprime to 100, leaving us with 
.
(d) 
; there are 51 multiples of 2, 34 multiples of 3, and 6 multiples of 17, between 1 and 102. Among these, we double-count 17 multiples of 2*3=6, 3 multiples of 2*17=34, and 2 multiples of 3*17=51; we also triple-count 1 number, 2*3*17=102. There are then 51 + 34 + 6 - (17 + 3 + 2) + 1 = 70 numbers between 1 and 102 that are not coprime to 102, and so 
.
