Then value of gold is appreciating 18% every hour you were lucky enough to have gold coin which was worth $40 at the beginning of the crisis write an equation that will represent y, the value of gold, after x hours

The equation is  

Step-by-step explanation:

The exponential growth equation is   , where

∵ The value of gold is appreciating 18% every hour

∴ r = 18%

∵ 18% = = 0.18

∴ r = 0.18

∵ The gold coin was worth $40 at the beginning of the crisis

∴ The initial amount is $40

∴ a = 40

∵ y represents the value of the gold after x hours

∴

- Substitute the values of a and r in the form above

∴

∴

The equation is