Answer: X = -9
Step-by-step explanation:
You can set up a ratio to solve this.
208/13 = -144/x
208x=-1872
x = -9
 
        
             
        
        
        
Answer:
<h2>: 7-⁴</h2>
Step-by-step explanation:
<h3>Exponential Form :</h3><h3>(a^m*a^n ) = (a^m+n )</h3>
<h3>7^-6 = 7^-2 * x </h3>
<h3>(only 7^-4 the term that can add to 7^-2 gives </h3><h3>= 7^-6 )</h3>
<h3>7^-6 = 7^-2 + 7^-4 </h3>
<h3> ( a^m*a^n) = ( a^m+n)</h3>
 
        
             
        
        
        
Answer:
Dimensions :
x (the longer side, only one side with fence )   =  90  ft
y ( the shorter side two sides with fence )        =  45  ft
Total fence used   45 * 2  +  90    =  180 ft
A(max)  =  
Step-by-step explanation: If a farmer has 180 ft of fencing to encloses a rectangular area with fence in three sides and the river on one side, the farmer surely wants to have a maximum enclosed area.
Lets call "x" one the longer side  ( only one of the longer side of the rectangle will have fence, the other will be along the river and won´t need fence. "y" will be the shorter side
Then we have:
P = perimeter  =  180  =  2y  +  x        ⇒   y  =  ( 180 - x )  / 2        (1)
And   A (r)   =  x * y
A(x)   =  x  *  ( 180 - x ) /2       ⇒   A(x)   = (180/2) *x   -  x² / 2
Taking derivatives on both sides of the equation :
A´(x)   =  90   -  x     
Then if    A´(x)   =  0   ⇒        90   -  x    =  0     ⇒   x  =  90 ft
and from :       y  =  ( 180 - x )  / 2     ⇒     y  =  90/2
y  =  45  ft
And 
A(max)  =  90 * 45    =  4050  ft²
 
        
             
        
        
        
Once your friend has thought of a number, do the following: 
1. Ask him or her to multiply the chosen number by 2.
2.Choose an even number to use yourself. Ask your friend to add this number to the one in his head.
3.Tell him/her to divide the new number by 2.
4.Tell your friend to subtract his original number from the equation.
5."Guess" the number.
:)
        
             
        
        
        
Answer:
y=3x+5
Step-by-step explanation:
I think that this is what they mean...
y=mx+b
y=3x+b
y=3x+5
plug in #s
5=15+5
5=20 no