Find the area of a circle with diameter, d=8m give the awnser in terms of pi

For what values of b will f(x)= logbx be a decreasing function? (16 )

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?

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?