Cosecant (csc) is defined as the reciprocal of sine, therefore:

.
1/sinx will be undefined when the denominator sinx = 0.
Recalling the unit circle, sinx = 0 at x = 0 ± πn, where n is an integer.
Since the domain x is restricted from (0, 2π), we only consider the values x = 0, x = π, and x = 2π.
Therefore in the domain 0 ≤ x ≤ 2π, y = csc(x) will be undefined at x = 0, x = π, and x = 2π.
Answer:
a=
or 
Step-by-step explanation:
Equate the equation to zero
-9a+2=0
-5a-4a+2=0
5a(2a-1)-2(2a-1)=0
Write out the factors
(5a-2)(2a-1)=0
Then equate each factor to zero
5a-2=0 OR 2a-1=0
5a=2 OR 2a=1
a=
OR a= 
a=
or 
A scale of one filthiest would be written as 1:50,
this means for every foot of the model would be 50 feet for the actual tower
so you would multiply the dimensions of the tower by 50 get the actual dimensions.
height: 2.25 ft x 50 = 112.50 feet high = 113 feet ( rounded)
width: 1.25 x 50 = 62.5 feet wide = 63 feet (rounded)