Answer:
The discount is $0.8d.
Step-by-step explanation:
Given that,
The original cost of Tamara's purchase is d dollars.
Tamara uses a coupon to save 20% off her purchase at the bookstore.
Discount = 20%
Discount is applied to the original cost.
Discount = d-(20/100)d
Discount = 0.8 d
Hence, the discount is $0.8d.
480 is 100%
48 = 10%
480 = 100%
Answer: 
Step-by-step explanation:
<u>Given information</u>


<u>Given the formula for the slope</u>

<u>Substitute values into the formula</u>

<u>Simplify the numerator and the denominator</u>


<u />
<u>Simplify the fraction</u>


Hope this helps!! :)
Please let me know if you have any questions