Answer:
10 times.
Step-by-step explanation:
The number in the tenths place is 90. The number in the ones place is 9. 9 times 10 is 90.
 
        
             
        
        
        
Answer:
No solution
Step-by-step explanation:
So we have the equation: 

First, subtract 20 from both sides: 

Now, we can stop. Recall that absolute value will always <em>always</em> give a positive answer. 
Since this equals -16, this means that there is no solution. 
And we're done!
 
        
             
        
        
        
1: m=-4
2: b=-4
3: -9=k
4: C=-11.4
5:X<10
        
             
        
        
        
Answer:

Variable is a symbol that represents a quantity in a mathematical expression, as used in many sciences. Variable (research), a logical set of attributes. Variable star, a type of astronomical star.

A constant, sometimes also called a "mathematical constant," is any well-defined real number which is significantly interesting in some way. A function, equation, etc., is said to "be constant" (or be a constant function) if it always assumes the same value independent of how its parameters are varied.