an item was selling for $72 is reduced to $60 find the precent decrease in price round your answer to the nearest tenth
1 answer:
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You solve the equation : t^2 - 9t - 90 = 0 ;
Δ = ( - 9 )^2 - 4 * 1 * ( - 90 ) = 81 + 360 = 441 ;
t1 = ( 9 +
) / 2 = 30 / 2 = 15 ;
t2 = ( 9 -) / 2 = -12 / 2 = - 6 ;
The numbers are 15 and - 6 ;
Δ = ( - 9 )^2 - 4 * 1 * ( - 90 ) = 81 + 360 = 441 ;
t1 = ( 9 +
t2 = ( 9 -
The numbers are 15 and - 6 ;