Which logaritmic graph can be used to approximate the value of y in the equation 4^y=8

By definition, if

         
then 

    
In this case, if

 
then 


We have:




or 

logaritmic graph (Follows the attachment):

Do the math. she originally had 50 dollars on her gift card and she had 12 dollars left on her gift card after she finished her shopping spree. if you subtract 50 minus 12 you get thirty eight dollars as your answer. so therefore, ciara spent 38 dollars total o