I WILL GIVE YOU BRAINLIEST, AND 30 POINTS SO PLEASE HELP ME, IT'S URGENT!

31.5 units^2

Step-by-step explanation:

This is a right triangle

The x dimension is from B to C

-4 to 3 is 7 units

The y dimension is from A to B

5 to -4 = 9 units

The area of a triangle is

A = 1/2 bh

A = 1/2 (7)(9)

   = 31.5

First one:

31.5 units²

Step-by-step explanation:

AB: 5 - (-4) = 9 units

BC: 3 - (-4) = 7 units

ABC is a right angle triangle with 90° at B

Base: BC

Height: AB

Area:

½ × base × height

½ × 7 × 9

31.5 units²

2nd one in the first row is correct

(f - g)(x) = 5x^3 - 3

step-by-step explanation:

rearrange these functions vertically, with like terms in separate columns:

f(x) = 5x^3 - 2

g(x) =         +1

now subtract, column by column:

(f - g)(x) = 5x^3 - 3