Determine if the pair of ratios or rates are equivalent. $18 for 3 bracelets ; $30 for 5 bracelets are these equivalent yes or no

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

Icould really use some with this question.

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up