What the answer to this i dont think im right

The graph shows the distance kerri drives on a trip. what is kerri's speed?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

The function f(x)= -(x+5)(x+1) is down. what is the range of the function?