Plz help me answer this question

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

What are the domain and range of f(x)= -log5(x+2)

Th perimeter of a rectangular garden is 150 feet. the length is 50 feet longer than the width, w. which equation could be used to calculate the width of the garden? a.) 2w+ 2(w-50) =150 b.) 2w+50 + 2w =150 c.) 2(w+50) + w =150 d.) 2w+ 2(w + 50) = 150 need asap. will give brainliest !