Answer:
Eleana is 20 years old.
Her grandfather is 80 years old.
Step-by-step explanation:
Suppose Eleana's age is "x". That means her grandfathers age is 4x.
x+4x= 100
5x=100 Divide both sides by 5
x=20 That means Eleana is 20 years old.
Her grandfather would be 4 times her age so his age would be 40 years old.
Answer:
0
Step-by-step explanation:
The explanation is in the attached file.
Sidenote: Hope this helps! :D
Answer:
1^2 = 1
2^2 = 4
3^2 = 9
n^2 = 10000 --> n = 100
the number 10000 is on place 100.