If point

is on the unit ircle, then:

Since, the point is in the second quadrant, x is negative.
Thus,

Part A:

Therefore,

.
Part B:

Therefore,
This is a question related to Science dear!
1 pound = 1.28 dollar
We can multiply to find the amount he has.
3750 * 1.28 = $4800
Therefore, the answer is B.
Best of Luck!
This answer would be (-14).