A jacket is on sale for $15 off. As part of a one-day sale, a 20% discount is applied to all purchases. If x represents the orig
2 answers:
Answer:
The equation will be : 0.8x – 12
Step-by-Step Explanation:
Let the original price of the jacket be = x
As given, the jacket is on sale of $15 off, so the sale price is = x-15
Its also given that as part of a one-day sale, a 20% discount is applied to all purchases which means that after the 20% discount, the final price will be 0.80 times the sale price.
So, the final price of the jacket will be :
=
(Though options or equations are not given to choose from, but this is the only correct answer.)
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The initial mass of an element is 800 grams.
Decay rate = 8.2% per day
Number of days = 15
To find:
The remaining element after 15 days.
Solution:
The exponential decay model is
Where, a is the initial value r is the rate of interest and t is time period.
Putting in the above formula, we get
Therefore, the mass of the remaining element is 221.7 grams.