book Maths Puzzle Numerical Ability

how do you put this in scientific notation 0.000000000761

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The revenune of a small concert promoter depends on the number of unsold concert seats. If 100 seats are sold, the price is $50. Each unsold seat increases the price per seat by $1 What is the y-coordinate of the center of the circle that passes through (-1,2),
(3,2), and (5,4)?