Please solve this ASAP

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

What are the domain and range of the function? f(x) = -4 (sqrt)x

Alana has 12.5 cups of flour with which she is baking four loaves of raisin bread and one large pretzel. the pretzel requires 2.5 cups of flour to make. how much flour is in each loaf of raisin bread? explain the steps to follow to get the answer.