Use properties of operations to write an expression equivalent to the sum of the expressions 3 (g + 5) and 2 (3g - 6)

Well, you would istribute

using

a (b+c) = ab+ac

so

3 (g+5) = 3 (g) + 3 (5) = 3g+15

2 (3g-6) = 2 (3g) + 2 (-6) = 6g-12

now we gots

3g+15+6g-12

using commutative, we can arrange and group like terms because

a+b=b+a

so

3g+6g+15-12

add

9g+3