Can some one me on my online class physical science i need it finished but wednesday to graduate in 1 week will pay $90 dollars if you finish it for me have to do 5 units but if you pass the pretest it lets you move on to the next unit someone me need lots of

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?