Can someone please help

Find the value of the cosine for angle a

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

An object is accelerating at a constant rate. its velocity in feet per second as a function of time in seconds can be modeled by the linear function v(t) = 2.5t. what does the dependent variable represent for this function? a) acceleration b) distance c) slope d) velocity