Answer:
2  Beetle juices and 3 Potion Punch
Step-by-step explanation:
j = Beetle Juice       cost $2.50
p = Potion Punch      Cost $3
          j + p = 5                      <em>Multiply by -3</em>              -3j  - 3p = -15
 $2.50j + $3p = $14           <em>Do not change      </em>+ <em>  </em><u><em> </em></u><u>2.50j  -3p = 14      </u>
                                                                                  - .50j      = -1
                                                                                           j = 2   Beetle Juice
    Substitute into the fist equation and solve for y       j + p = 5
                                                                                          2 + p = 5 
                                                                                               p = 3   Potion Punch
 
        
             
        
        
        
Let number of miles be x 
<span>when is </span>
<span>.5x + 25 = .25x + 30 </span>
<span>times 4 </span>
<span>2x + 100 = x + 120 </span>
<span>x = 20 </span>
        
             
        
        
        
Answer:
a) 9 meters.
b) The total change in temperature was of 288ºC
Step-by-step explanation:
Both these questions can be solved using rules of three.
a) 72 meters in 8 seconds. How many meters it changes each second(in 1 second)?
8s - 72m
1s - x m



9 meters.
b) In 1 hour, heated by 6ºC. How much in total during 48 hours?
1h - 6ºC
48h - xºC
x = 48*6
The total change in temperature was of 288ºC