Answer:
O=30° or O=29°
Step By Step Explanation:
∠α =arcsin(	a/c	)
=	arcsin(4/8)
=	arcsin(0.5)
=	0.5 rad = 30° = 29°
I Hope This Helps. I Gave you 2 answers just in case 1 is Wrong. And I Hope you Understand This Calculation, I Used Different Variables and the arcsin thing is something my teacher told my class to use, and I Have no Idea what it means because my teacher never explained what it meant, Sadly.
 
        
             
        
        
        
Answer:
4 3/4
Step-by-step explanation:
 
        
                    
             
        
        
        
slope intercept form:
y = mx + b
m = slope
b = y-intercept
the y-intercept is the place on the y-axis (vertical) where the line crosses. In this problem, the line crosses at (0,4), meaning the y-intercept is 4.
y = mx + 4
the slope is technically the rate of change (rise over run) bewteen points.
If you take the distance from point (-1,3) and (0,4) you get a slope of 1/1, or just 1
y = 1x +4
this could also be: 
y = x + 4
(because the 1 is invisible but still there)
 
        
             
        
        
        
Answer:
2.80
Step-by-step explanation:
4% of 70 is = 2.80
70% of 4 is = 2.80