Practice problem
If 400400400 mg of ibuprofen decreases about 30%30\%30% every hour, how long would it take for 424242 mg to remain?
6.3 hours6.3\ \text{hours}6.3 hours
5.3 hours5.3\ \text{hours}5.3 hours
4.3 hours4.3\ \text{hours}4.3 hours
3.3 hours3.3\ \text{hours}3.3 hours
Type a concept, like “slope” or “photosynthesis”.