A regression equation is y^=30+5x\hat{y} = 30 + 5xy^=30+5x. If the predicted value is y^=60\hat{y} = 60y^=60, what is xxx?
x=6x = 6x=6
x=18x = 18x=18
x=12x = 12x=12
x=90x = 90x=90