SOLUTION: Please help me make an equation for this story problem: Angie Godddard's earning from babysitting doubled each week for four weeks. if she earned $90 in all during the four weeks,

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Question 906661: Please help me make an equation for this story problem: Angie Godddard's earning from babysitting doubled each week for four weeks. if she earned $90 in all during the four weeks, how much did she earn the first week?
Found 2 solutions by Alan3354, josmiceli:
Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website!
Please help me make an equation for this story problem: Angie Godddard's earning from babysitting doubled each week for four weeks. if she earned $90 in all during the four weeks, how much did she earn the first week?
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She was pain D dollars the 1st week.
Then 2D
Then 4D
Then 8D
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Total = D + 2D + 4D + 8D = 15D
15D = $90
D = $6
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If she continues to have her pay doubled each week, she should keep that job
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Week 5 --> $16
Week 6 --> $32
Week 7 --> $64
Week 8 --> $128
Week 9 --> $256
Week 10 --> $512
Week 11 --> $1024
Week 12 --> $2048
...
Week 30 --> $1,073,741,824
A billion dollars a week is not bad.

Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website!
Let = earnings for 2nd week
= earnings for 3rd week
= earnings for 4th week
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She earned $6 the 1st week
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check:

OK