Answer:
all real numbers.
Step-by-step explanation:
First, distribute 3 to all terms within the parenthesis: 
3(x + 4) = 3(x) + 3(4) = 3x + 12
3x + 12 = 3x + 12
Because both sides are the same, your answer for x is "all real numbers". 
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The truck can cover 145 miles in 2.5 hours, so the speed of the truck is 
145÷2.5=58 miles per hour
the car's speed is 1.5 times faster: 58×1.5=87 miles per hour
suppose in x hours they will meet: 
distance covered by truck in x hour: 58x
distance covered by car in x hour: 87x
total distance: 145 miles
58x+87x=145
x=1
        
             
        
        
        
Answer:
(-2) ; (-50)
Step-by-step explanation:
(-2) *(-50) = 100
(-2) + (-50) = -52
 
        
             
        
        
        
Answer: It is rational because it can be converted to a fraction since it terminates. 
Step-by-step explanation:
As
 
        
                    
             
        
        
        
The questions ask you to caculate how many elements must a set of numbers of proper subsets of the set 1/2 of the total number of subsets per a subset,base on the question I bet the answer is 1 I hope this helps let me know if u passed and I will try to work it out again GREAT LUCK!!