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Bhavana

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1.39
It's 7.
Yes it is correct
For the first minute the cost is $1.25 and for the remaining 9 minutes it is $0.10 Cost for 10 minutes phone call =$1.25 +9x$0.10 =$1.25+$0.90 =$2.15.
The above series is a combination of two series, 7,8,9,10,11 and 8,9,10,11,12. The series can be filled as 7 9 8 10 _9__ __11_ 10 12
Let the number of years passed be x. So, (22-x)=4(10-x) (22-x)=40-4x 4x-x=40-22=18 3x=18 x=6 It is 6 years ago that Ann was four times as old as terry
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