3+ 0.15= 3.15?
or
3x-0.45=9?
Hope this helps. :)
        
             
        
        
        
-8 * -4 = 32
Just multiply both numbers and negatives cancel
        
             
        
        
        
Answer: option D
Step-by-step explanation:
X+8=-2
     x= -2-8 (you should make x the subject so you switch the +8 to the other 
     x= -10                                                                   side which becomes -8)     
so you get -10 because, if both the numbers have the minus sign then you should add the two values which will be a negative answer. So your answer is option D   
 
        
                    
             
        
        
        
Answer:
x=6
Step-by-step explanation:
Group Like Terms:
3x+x+30=10+2x+5x+2
Add similar elements 3x+x=4x:
4x+30=10+2x+5x+2
Add similar elements 2x+5x=7x:
4x+30=10+7x+2
Group like terms:
4x+30=7x+10+2
Add the numbers 10+2=12:
4x+30=7x+12
Subtract 30 from both sides:
4x+30-30=7x+12-30
Simplify:
4x=7x-18
Subtract 7x from both sides:
4x-7x=7x-18-7x
Simplify: 
-3x=-18
Divide both sides by -3:

Simplify:
x=6
Hence, the correct answer is 6
 
        
             
        
        
        
Answer:
 =
 = 
Step-by-step explanation:
In this case in order to simplify we need to know what the "power rule of exponents" is. Simply speaking this rule states that when you raise a power to  a power you multiply the exponents. So in our case we ill get the following
 =
 = 
In order to get 42 we used the power rule which I mentioned earlier.