Answer:
1. No.
2. Yes, there is no solution here.
Step-by-step explanation:
The former:

 is our set of solutions.
 is our set of solutions.
The latter:

In other words, there is not any solution from the set of real numbers that suits us.
 
        
             
        
        
        
Answer/Step-by-step explanation:
A) The temperature in Chicago could be -10*F because -10 is to the right of -13 on the number line.
Higher Temperatures -->
o----------->I
I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I---I
-13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1   0  1   2  3  4  5  6  7  8  9 10
 
        
                    
             
        
        
        
Answer:
#6 is called exponent 
Step-by-step explanation:
(x,y) is a pair of real numbers. The meaning is: (x,y) is an ordered pair of numbers belonging to R×R=R2 .
 
        
             
        
        
        
Answer:
Our two numbers are 50 and 20
Step-by-step explanation:
Sum means add together
Difference means subtract each other
x + y = 70
x - y = 30
subtract from each other
2x = 100
divide both sides by 2
x = 50
our first number is 50
50 + y = 70
subtract both sides by 50
y = 20
Our two numbers are 50 and 20
 
        
             
        
        
        
50 divided by 40 equals 1.25! So the car is going 1.25 mph