When s is measured in meters and t is measured in seconds, find the velocity at t = 2 of the following

a. s = t^2 + 3t

b. s = t^3 - 3t^2

c. s = squareroot t + 2

Help plz

just use the power rule. For example,

a. v(t) = 2t+3
v(2) = 2*2+3 = 7