exam
Maths Puzzle
Numerical Ability
3x2 + 2x = 7
x2 + 8x+9=-7
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exam Other Question
x2+7x+10=0 I guess
A computer bulletin board service charges a flat fee of $10 per month or $4 per month plus $.10 for each minute the service is used. For how many minutes must a person use this service for the cost to exceed $10?