Hey guys, I'm in year 9 and our teacher gave us some extension work and it's on vectors which we've never done before. These questions are probably really basic but it would be great if you could give me a hand with them

2. Given the vector (-5,12) find the following vectors:

a) same direction, twice as long

b)same direction, length 1

c) opposite direction, length 10

d) opposite direction, length c

Im really lost on the above ones

4. Find the lengths of the following vectors:

a) (3,4)

From what i've tried to read on wiki the answer to this is 5 (pythagoras)

b) 1998(3,4)

I don't understand what a number in front means

c) 1998/5 (3,4)

d) t(3,4)

Thanks heaps guys