Someone plz help...if you know this help me ​also Im giving 30 points

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles