(WILL GIVE BRAINLIEST) Can someone answer number 8.b step by step?

Three times the sum of a number and seven is negative thirty-six. what is the number?

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?

The paint recipe also calls for 1/4 cup of food coloring. tyler says mrs.mcglashan will also need 6 cups of food coloring. do u agree or disagree? explain.