Answer:
D) 67.4°
Step-by-step explanation:
by observation, and noting that triangle PQR is a right triangle
sin R = opposite length / hypotenuse
in our case, the hypotenuse is PR = 13 and the length opposite form R is QP = 12
hence
sin R = opposite length / hypotenuse
sin R = 12/13
R = sin⁻¹ (12/13) = 67.4⁰
 
        
             
        
        
        
F=60, s=60/2=30
(60-x)/(30-x)=4
60-x=120-4x
60+3x=120
3x=60
x=20  
s=30-x
s=30-20
s=10
So the boy was 10 years old when his father was four times his age.
        
             
        
        
        
Answer:
The Domain.
Step-by-step explanation:
That is the Domain.  For example the domain of the function √x is the set 
{x : x ≥ 0}.
 
        
             
        
        
        
Answer:
B. StartFraction R Y Over R S EndFraction = StartFraction R X Over R T EndFraction = StartFraction X Y Over T S EndFraction
i.e 
 = 
 = 
Step-by-step explanation:
Two or more shape or figures are similar when their sides and angles can be compared appropriately. 
In the given figure, ΔRXY is within ΔRST. Since the two triangles are similar, then their length of sides can be compared in the form of required ratios.
So that by comparison,
 = 
 = 
Therefore, the correct option to the question is B.
 
        
                    
             
        
        
        
Solve the rational equation by combining expressions and isolating the variable 
x
x
.
x
=
41