U varies inversely which means p³ will come as a denominator of the constant k.
Therefore, The equation formed will be:

its equal to because if you do +50-50 and keep going it will always go back to 0. Hope this helps! :D
7x20=140. 7x2000=14000. The only thing that changes the product of these numbers is the amount of zeros behind the 2. Since the only two numbers that affect the answer is the 7 and the 2. (7x2=14). The number of zeros behind the 2 affect how many zeros will be included in the product.