Urgent, please. Need this asap!

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

What is the value with a place of tenths in 907.456 1) 0 2) 6 3) 4 4) 5

Jonah runs 3/5 miles on sunday and 7/10 mile on monday. he uses the model to find that he can ran a total of 1 mile . what mistake does jonah make