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
![\frac{15}{100}=0.15](https://tex.z-dn.net/?f=%5Cfrac%7B15%7D%7B100%7D%3D0.15)
Multiply
![0.15(58.89)=8.83](https://tex.z-dn.net/?f=0.15%2858.89%29%3D8.83)
Add this to the original amount.
![58.89+8.83=67.72](https://tex.z-dn.net/?f=58.89%2B8.83%3D67.72)
----------------------------------------------------------------------------
Calculate 20% of 148.25
Convert 20% to decimals by dividing by 100
![\frac{20}{100}=0.20](https://tex.z-dn.net/?f=%5Cfrac%7B20%7D%7B100%7D%3D0.20)
Multiply
This is how much they will tip.
Add this to the original bill;
![148.25+29.65=177.90](https://tex.z-dn.net/?f=148.25%2B29.65%3D177.90)
R = 17/2 =8.5 m
A = 3.14 x (8.5)^2
A = 3.14 x 72.25
A = 226.865
answer <span>226.9 m² (third choice)</span>
4,000,000 and 20,000,000 miles²
let x be the area of one desert then 5x is the area of the other
sum = x + 5x = 24,000,000
6x = 24,000,000
divide both sides by 6
x = 4,000,000
one desert is 4,000,000 miles²
and the other is (5 × 4,000,000)= 20,000,000 miles²