For the first part, the possible numbers are anything from 20 to 99. That means that there are 79 possible choices that are greater than 19. Sorry I can't help you with the second part.
Answer:
Step-by-step explanation:
Given expression : 
Solving further:
So,
So, Option A is true
Hence the given expression is equivalent to Option A
Answer:
HCFD
Step-by-step explanation:
a² + b² = c² => a² = c² - b² => a = √(c² - b²)
=> the height of the window = √[(the given length of the latter)² - (the distance from the latter to the base of the building, 3.5 meters)²]
A) √(5.5² - 3.5²) ≈ 4.24 => H
B) √(8.8² - 3.5²) ≈ 8.07 => C
C) √(9.3² - 3.5²) ≈ 8.62 => F
D) √(7.9² - 3.5²) ≈ 7.08 => D
54330, 54360, 54399 are all numbers that are lower than 54400 but greater than 54300
