Answer:
7.61 miles
Step-by-step explanation:
Given that,
Haley hikes 3 miles north and 7 miles east.
We need to find the shortest distance from the campground to the waterfall. Let the distance is D.
It can be calculated as follows :

So, the shortest distance from the campground to the waterfall is 7.61 miles.
15, 18, 21
i don't know the other one, sorry
Answer:
Use PEMDAS so division would be the first step
Step-by-step explanation:
1)Parentheses
2)Exponents
3)Multiplication
4)Division
5)Addition
6)Subtraction
The answer is 21 because 189 divided by 9 is 21