Pls help
see the attachments

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

What is the slope of the line shown below?

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191