Determine the value of H and B

PLEASE HELP I DON'T HAVE MUCH TIME TO ANSWER ;-;

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

The table above shows approximate conversions from gallons to liters. what is the value of x?

Aswimming pool is a rectangle with semicircles on the end. the rectangle is 12 meters wide and 30 meters long. the diameter and width of the swimming pool are equal. sketch and label an overhead diagram of the swimming pool. find the area of the swimming pool floor.