Plz fastt

find the area of triangle abc with vertices a(2, 3), b(1, -3), and c(-3, 1).
a.
10 units2
c.
14 units2
b.
12 units2
d.
16 units2

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Icould really use some with this question.

What is the value of x in this triangle? a. 53° b. 62° c. 65° d. 118°