Answer: D
Step-by-step explanation:
multiply the denominators then the numerators
3(9) = 27
3(7) = 21
3(9+7) = 48
27+21 = 48
48=48
Step-by-step explanation:
you can follow the same procedure for others
Blue triangle: perimeter is 4x+2+7x+7+5x-4, or, after simplification,
16x + 5
Red triangle: perim. is 2x-5+x+7+x+3 (and so on).