Find the unit tangent vector T(t) at the point with the given value of the parameter t. r(t) =

t2 − 3t, 1 + 4t,
1
3
t3 +
1
2
t2

, t = 3

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?