115 on a coordinate plane, draw triangle abc with vertices
a(-1, -1), b(3, -1), and c(-1, 2). find the area of the triangle
in square units.

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3

i belive those are the ones that are under 90 degreese.