Speed vs Velocity

Q.

Speed is a _____ quantity but velocity is a _________ quantity.

1. scalar, scalar

2. vector, vector

3. vector, scalar

4. scalar, vector

Q. A particle starts from $x=0$ and moves along a straight line such that its velocity $v$ depends on position $x$ as $v=x+4$.
For the first four seconds, average speed of the particle (in $m/s$) is

1. $e^4+1$
2. $e^4-1$
3. $e^4+4$
4. $e^4-4$