What is the equation of the circle that has a center of (6,4) and passes through the point (9,12)?

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Could somebody me with this radical simplification?

Which of the following graphs could represent a cubic function?