Can you guys please help me out

Which of the following represents an upright image? a. -do b. +m c. -m d. +do

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.