help me with maths

[rustic swan]

(0 -3) (write as a column vector I couldn't quite do it over text)

imagine a column vector
(x
y)
in this case it shows a translation of x units to the right and y units upwards - we want it to go 3 units downwards so we go for -3 in the place of y

for the second question

you are given the area, so you can find the height of the triangle

once you've found the height, use trig (tan) to find angle y