in some places, sales tax is 8% of the total bill amount.how much sales tax would be charged for a bill totaling $90?

Consider the function y = f(x)=3^x the values of f(1/2) and f(1/4). rounded to the nearest hundredth, are__and__ respectively

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?