How are imaginary numbers useful in solving quadratic equations?

If the roots of a quadratic equation are imaginary, ... It quickly tells you if the equation has two real roots (b2 - 4ac > 0), one real repeated root (b2 - 4ac = 0) or two complex conjugate roots (b2 - 4ac < 0).

Explanation:

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she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )

what is the answer to this