Michelle is four times as old as Fiona. Fiona is twice as old as Madeline. Madeline is seven years old. How old is Michelle?
2 answers:
Answer:
michelle is 56 years old
Step-by-step explanation:
start with madeline you know she's 7, move on to fiona we know she is twice as old as madeline so we mulitply 7 times 2, we get 14. now we know fiona is 14 and in order to find michelles age we multiply times 4 because shes four time fionas age. 14x4=56.
First find fionas age
Fiona is 2x as old as madeline
madeline is 7
mulitply 7*2 which gives you 14
that means fiona is 14
multiply 14 by 4 which gives you 56
michelle is 56
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Answer:
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Step-by-step explanation:
Answer:
x=8
Step-by-step explanation:
(2x + 1)² = x² + (2x - 1)² = x² + (2x - 1)(2x - 1)
(2x + 1)(2x + 1) = x² + 4x²-2x-2x+1
4x²+2x+2x+1 = 5x²-4x+1
4x²+4x+1 = 5x²-4x+1
0= 5x²-4x²-4x-4x+1-1
0= x²-8x
x²-8x=0
x²=8x
x=8
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