Answer:
9 days
Step-by-step explanation:
Since the secret spread at a geometric rate we will use the geometric progression formulae
ar^n-1
First term = a= 5
common ratio is 2
For the nth term
5*2^n-1 = 1280 divide both sides of the equation with 5
2^n-1 = 256
2^n-1= 2^8
n-1 =8
n = 8+1
n=9
All the children will know the secret in 9 days
Alternatively
2nd day= 5*2^2-1
5*2^1=
5*2= 10
3rd day = 20
4th day= 40
5th day= 80
6th day = 160
7th day = 320
8th day =640
9th day =1280 children
Answer: 30 mph
Step-by-step explanation: Divide 158,400 by 5280(the amount of feet in a mile) to get your answer.
Real answer
48
*26
------
1,248
Estimate
50
*25
------
1,250
So the answer is..
Estimating is helpful because it makes sure you answered correctly. No, this answer is incorrect and if he had done the estimate he could have seen how he was wrong.
Answer:
6 pounds.
Step-by-step explanation:
70-25.36= 44.64 (the amount of money she spent)
44.64/7.44 (per pound cost)= 6
