Answer:
your answer would be D. x = 2.5 + y
Step-by-step explanation:
 
        
                    
             
        
        
        
The diameter would be d≈288.85!
I hope this helped! Brainliest? :) -Raven❤️
        
             
        
        
        
Let x = speed of the first car
the second car is 12 km slower so the seconds car speed is x-12
 they each drove 2 hours so 1st car = 2x
2nd car = 2(x-12)
 
they drove 360 km
 so you have 2x + 2(x-12) = 360
 solve for x
2x+2(x-12) = 360
2x + 2x-24 = 360
4x-24 = 360
4x = 384
x = 384/4
x = 96
1st car drove at 96 km per hour
slower car drove at 96-12 = 84 km per hour
        
             
        
        
        
Hey!! 
here is your answer >>> 
let's find x first , 
2x + 48 = 180 
2x = 132 
x = 66!. 
there is a right angle, 
the angle below the right angle is also 90° 
angle y would be , 
180 - (90+ 48) 
180- 138 
=> 42 
answer is 42!. 
if helped!. brainliest