Answer:
The correct option is (C).
Step-by-step explanation:
The exponential function representing decay is as follows:

Here,
<em>y</em> = final value  
<em>y</em>₀ = initial value  
<em>k</em> = growth rate  
<em>t</em> = time passed
The graph represents exponential decay is:
"On a coordinate plane, a graph approaches y = 0 in quadrant 1 and curves up into quadrant 2."
Thus, the correct option is (C).
 
        
                    
             
        
        
        
Answer:
x = 1
y = -1
z = 2
Step-by-step explanation:
You have the following system of equations:

First, you can subtract euqation (3) to equation (1):
x + 2y - z = -3
<u>-x +y  -z = - 4 </u>
0   3y  -2z = -7    (4)
Next, you can multiply equation (3) by 2 and subtract it to equation (2):
2[ x -y + z = 4]
<u> -2x +y -z = -5</u>
   0 -y + z= 3     (5)
You multiply equation (5) by 2 and sum (5) with (4):
2[ -y  + z = 3]
<u>    3y  -2z= -7</u>
   y  + 0 = -1
Then y = -1
Next, you replace y=-1 in (5) to obtain z:
-(-1) + z = 3
z = 2
Finally, you can replace z and y in the equation (3) to obtain x:
x - (-1) + (2) = 4
x = 1
 
        
             
        
        
        
“Line graphs are useful in that they show data variables and trends very clearly and can help to make predictions about the results of data not yet recorded. They can also be used to display several dependent variables against one independent variable.”
“With a line graph, it is fairly easy to make predictions because line graphs show changes over a period of time. You can look at past performance in a line graph and make a prediction about future performance.”