Answer:
J+2J=12 so 3J=12 so J=4
Step-by-step explanation:
Use J to represent Jake's miles. 
We know that Gloria's miles (G) is twice J, so G=2J
We also know that Jake and Gloria together ran 12 miles.
So we know, J+2J=12 or 3J=12   meaning J=4
So Jake runs 4 miles, and since Gloria is two times that she ran 8 miles.
 
        
             
        
        
        
I guess it s 30 irdk
 hope tis helps :D
        
             
        
        
        
Answer:
8cm and 9cm
Step-by-step explanation:
because for the triangle to work you need the other two other sides when added together needs to be greater then 13
 
        
             
        
        
        
Answer:
78 degrees
Step-by-step explanation:
All inner angles of a triangle make a sum of 180 degrees. Given 41 and 61 add up to 102, that leaves 78 degrees left to make 180
 
        
             
        
        
        
Answer:
Area of the regular dodecagon inscribed in a circle will be 27 square units. 
Step-by-step explanation:
A regular dodecagon is the structure has twelve sides and 12 isosceles triangles inscribed in a circle as shown in the figure attached.
Since angle formed at the center by a polygon = 
Therefore, angle at the center of a dodecagon =  = 30°
 = 30°
Since one of it's vertex is (3, 0) therefore, one side of the triangle formed or radius of the circle = 3 units
Now area of a small triangle = 
where a and b are the sides of the triangle and θ is the angle between them.
Now area of the small triangle = 
= 
Area of dodecagon = 12×area of the small triangle 
= 12×
= 27 unit²
Therefore, area of the regular octagon is 27 square unit.