Answer:
C
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
24
Step-by-step explanation:
75% of x = 18
75/100 * x = 18 (x =  total number of students)
solving 
x = 24
total number of students = 24
Checking:
75/100 * 24 = 18
 
        
             
        
        
        
Answer:
16/100 = 4/25
Step-by-step explanation:
4/10 * 4/10 = 16/100
 
        
             
        
        
        
A = b is given to us
Multiply both sides by c to get
a = b
a*c = b*c
The rule to multiply both sides by c is the multiplicative property of equality
Then on the right side, replace c with d. This replacement is possible due to the fact that c = d. This is using the substitution property.
So we go from
a*c = b*c
to this
a*c = b*d
        
             
        
        
        
Answer:

Step-by-step explanation:
In this problem, we have:
H = 452 m is the height of the Petronas tower
h = 1.75 m is the height of the woman
d = 120 m is the distance between the woman and the base of the tower
First of all, we notice that we want to find the angle of elevation between the woman's hat the top of the tower; this means that we have consider the difference between the height of the tower and the height of the woman, so

Now we notice that  and
 and  are the two sides of a right triangle, in which the angle of elevation is
 are the two sides of a right triangle, in which the angle of elevation is  . Therefore, we can write the following relationship:
. Therefore, we can write the following relationship:

since
H' represents the side of the triangle opposite to 
d represents the side of the triangle adjacent to 
Solving the equation for  , we find the angle of elevation:
, we find the angle of elevation:
