Answer:
1. $67.72
2. It's correct.
Step-by-step explanation:
1.
bill: $68.89
discount: $10
tip: 15%
Calculate the total with the discount.
68.89-10=58.89
Now calculate 15% of that.
Convert 15% to decimal by dividing by 100

Multiply

Add this to the original amount.

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Calculate 20% of 148.25
Convert 20% to decimals by dividing by 100

Multiply
This is how much they will tip.
Add this to the original bill;

4.2 is the answer of this question you are asking ✌️
Number 15 is 80 i dont know about the others...sorry
Answer:
d = (R+3)(M)
Step-by-step explanation:
d/M - 3 = R
Add 3 both sides
d/M = R+3
Multiply M both sides
d = (R+3)(M)
Hope this helps!