Answer:
67 and 69
Step-by-step explanation:
 
        
             
        
        
        
The answer is 14 because a negative number multiplied by another negative number is positive. So (-7)*(-2) is 14.
        
             
        
        
        
Answer:
x = 60° (Alternate angles) 
Step-by-step explanation:
a) x = 60° 
b) Reason: Alternate angles
 
        
             
        
        
        
Hi
k (a+b) = ka+kb 
so :  8 (3x+4) =   8*3x +8*4  =  24x +32 
 
        
                    
             
        
        
        
Answer:
s = 22.5 m 
Step-by-step explanation:
the equation for the speed change of a coach moving along a straight section of the road and starting braking at a speed of 20 m / s has the form v (t) = 25-5t. Using integral calculus, determine the coach's braking distance.
v (t) = 25 - 5 t 
at t = 0 , v = 20 m/s
Let the distance is s. 

Let at t = t, the v = 20 
So, 
20 = 25 - 5 t 
t = 1 s 
So, s = 25 x 1 - 2.5 x 1 = 22.5 m