Find area and perimeter
A. 12x;7x+3
B. 24x; 10x+8
C. 12x; 5x+14
D. 24x;5x+14

Area of a triangle = 1/2 x base x height:
Area = 1/2 x 8 x 3x = 12x
Perimeter = sum of the 3 sides:
4x-3 + x +9 + 8 = 5x +14
Answer: C. 12x; 5x+14