How much is 60% of 100 because i took a test and it said 60/100 but i am really confused on calculating it

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

Which of the following is a function? a.) {(-2, -4/5), (-1,-,,-1)} b.) {(-2,,1/,3/,1)} c.) {(-22)} d.) {(-21)}

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?