Answer:
x=20
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer and Step-by-step explanation:
Solution:
Statement:
If two planes intersect  their intersection is a line.
Suppose that 
P =if two planes intersect.
q = then their intersection is line.
¬p = if two planes do not intersect.
¬q = then their intersection is not a line.
Converse:
If two planes intersect their intersection is a line.
P → q
Inverse:
If two planes do not intersect, then their intersection is not a line.
¬p → ¬q
Contrapositive:
If two planes intersection is not a line, then they do not intersect.
¬q → ¬p
 
        
             
        
        
        
<span>d. y = 15x 900</span>
Although you do not give the rates I assume the answer is D as it is the only positive multiplication. You cannot have negative height.
        
                    
             
        
        
        
Y=x-7 this is because you subtracted the x to both sides. Since y is a negative, you divide by -1 causing the -x to turn positive and the positive seven to be negative seven. 
        
             
        
        
        
Answer:
   F ∪ H = {c, d, e, f, g, h}
   F ∩ H = { }
Step-by-step explanation:
The union is the list of elements that are in either of the two sets.
   F ∪ H = {c, d, e, f, g, h}
The intersection is the list of only those elements that appear in both sets. (There are none.)
   F ∩ H = { } . . . . the empty set