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djyliett [7]
3 years ago
8

Martha has $20 to spend on a t-shirt. She has a coupon for 20% off. The t-shirt regularly sells for $22.50 plus 10% sales tax.

Mathematics
1 answer:
rodikova [14]3 years ago
5 0

Answer:

1 and 3

Step-by-step explanation:

Step 1 is clearly elaborated.  Tax is impliedd on the discounted price.

In step 3, the steps of deductions are skipped.

Like 1 + 10% = 110% and 1 - 20% = 80%

Step 2 is simply wrong. Because the percentages are implied on different values.

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Let g the inverse function of f.

The most important property of g and f being inverses of each other, is that 

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Thus, we have:

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