What do you mean? At first it was 4 times as old, then it's twice her age?
Answer:
9 Signs
Step-by-step explanation:
The hiking trail is 4 kilometer long.
Signs are placed at the beginning and at the end of the trail.
4km = 4000m
We can solve this using simple arithmetic progression.
- The first term,a= 0
- The common difference,d= 500.
- The last term,l= 4000.
Therefore:
Last term, l=a+(n-1)d
4000=0+500(n-1)
4000=500n-500
4000+500=500n
4500=500n
Divide both sides by 500
n=9
Therefore, there are a total of 9 signs on the entire trail.
CHECK
The signs are placed at this marks
0m,500m,1000m,1500m,2000m,2500m,3000m,3500m and 4000m
Answer:
It is A again.
Step-by-step explanation:
Equation given:
We have to isolate 
Divide both sides by 
24 I think I am not for sure because what I did was subttact
C²=a²+b²
c²=20²+21²=400+441=841
c²=841
c=√841
c=29
Answer: 29 cm
