Which equation is equivalent to 3[x + 3(4x – 5)] = 15x – 24? 15x – 15 = 15x – 24
15x – 5 = 15x – 24
39x – 45 = 15x – 24
39x – 15 = 15x – 24

C.  39x - 45 = 15x - 24

Step-by-step explanation:

To solve this problem, we will follow the steps below;

3[x + 3(4x – 5)] = 15x – 24

First we will open the inner bracket. That is;

3[x + 12x - 15] = 15x – 24

The, we can now proceed to open the outer bracket, this can be done by multiplying all the inner brackets by 3

3x + 36x - 45 = 15x - 24

39x - 45 = 15x - 24

Therefore the equivalent of 3[x + 3(4x – 5)] = 15x – 24    is                            39x - 45 = 15x - 24

i believe the answer is the polygon, heptagon.