From the diagram, we know that it is an angle that adds up to 360
So
x+4x+2x+10+5x+50=360
Gather like terms 
12x+60=360
Move sixty to the other side as a negative number 
12x=300
Divide both sirs by twelve
x is equal to 25
AOB is 2x+10
Sub x in 2*25+10
AOB is 60
BOC is 5x+50
5*25+50, which is 175
BOD is x+2x+10
Which is 3x+10
Sub x 
3*25+10 which is 85
:)
        
                    
             
        
        
        
Answer: D
<u>Step-by-step explanation:</u>
Let x represent the score on her next test


78 + 92 + 88 + 89 + x = 5(90)
                       347 + x = 450
                     <u> -347      </u>   <u>-347 </u>
                                 x = 103
 
        
             
        
        
        
Answer:
Part 19) x=5
Part 20) x=-3
Step-by-step explanation:
Problem 19) Find the value of x so that f(x)=7
step 1
Find the intersection point of the given line in the graph with the line y=7
The intersection point is (5,7)
see the attached figure
therefore
The x-coordinate of the intersection point is the value of x when f(x)=7
x=5
f(5)=7
Problem 20) Find the value of x so that f(x)=7
step 1
Find the intersection point of the given line in the graph with the line y=7
The intersection point is (-3,7)
see the attached figure
therefore
The x-coordinate of the intersection point is the value of x when f(x)=7
x=-3
f(-3)=7
 
        
             
        
        
        
Answer:
   x = 18
Step-by-step explanation:
The parts of the triangles are proportional, so you can write ...
   2x/80 = 27/60
Multiply by 120:
   3x = 54
Divide by 3:
   x = 18
 
        
             
        
        
        
513/2=256.5
which means 256 and 257 are the answers