Answer:
answer 15  correct option is b. 73.7° 
answer 16 correct option is с. 47°
Explanation:
we know that on 4th july Northen hemisphere have summer and Washington, D.C also in Northen hemisphere
and sun present at 23.5° latitude 
so latitude of sun is calculate as given figure below 
= 90° - ( 39° - 23.5° ) 
= 74.5° 
so correct option is b.73.7 
this difference if because we take latitude 23.5°  that is approx on 24 july 
but july 4 latitude will be some low 
and 
we know during summer declination angle is + 23.5 in N.H.
and during winder declination angle is - 23.5 in N.H.
and at spring and autumn sun is at equator
the declination angle change is 
declination angle change = 27.5 + 27.5 = 47°
 
        
             
        
        
        
The official White House street address is: 1600 Pennsylvania Ave, NW. Washington DC 20500
 
        
             
        
        
        
Answer:
A straight angle measures 180°. ... An angle can be measured using a protractor, and the angle of measure 90 degrees is called a right angle. In a right angle, the two arms are perpendicular to each other. When the right angle is divided into two equal parts each angle measures 45°.
 
        
             
        
        
        
Southeast Asia is divided into <span>a peninsula and several archipelagoes.</span>