B. infinitely many solutions
Given:
Consider the complete question is "A speed walker covered
mi in
hour. How far will he walk in 3/4 hours if he walks twice as fast?"
A speed walker covered
mi in
hour.
To find:
Distance covered by him if in 3/4 hour if he walks twice as fast.
Solution:
We have,

It means a speed walker covered
mi in
hour.
If the speed is twice then he can cover double distance is same time.
Distance covered by him if in 3/4 hour if he walks twice as fast is

Therefore, distance covered by him is 9 mi.
Answer:
n=2.5
Step-by-step explanation:
- (2n + 4) + 6 = -9 + 4(2n + 1)
- 2n+10=-9+8n+4
- 2n+10=8n-5
- 8n-2n= 10+5
- 6n=15
- n=15/6
- n=2.5