Answer:
a.) Q= 21 - 7t
b.) Q = 21 - 1.26t
c.) Q = 21 - 2.1t
Step-by-step explanation:
a.) if it starts with 21grams, and it decreases with 7grams per day, then the remainder after t days becomes:
Q= 21 -7t.
For example, after one day, that is when t=1, the remainder becomes
Q= 21 - 7(1) = 14grams.
b.) if the decrease is 6% per day, we first calculate the 6% of 21, that is
21 * 6/100 = 1.26.
Hence, after t days, the remainder becomes:
Q= 21 - 1.26t.
For example, after 3 days, that is when t=3, the remainder becomes:
Q= 21 - 1.26(3) = 21 - 3.78
Q= 17.22grams.
c.) if the decrease is at 10% per day, and 10% of 21grams is 2.1grams, then the remainder becomes:
Q= 21 - 2.1t
