Answer:
a 17
Step-by-step explanation:
20 + 5 - 8
Since it is 4 times as many quarters and dimes, you can use a chart for guess and check. I started with 8 dimes and 32 quarters.
If you keep going, you end up with the fact that there are 36 quarters and 9 dimes.
Answer:
y=40x
Step-by-step explanation:
After one hour the amount of caffeine would be 85.6% of the original amount. 85.6% of 129 mg is 110.42 mg.