Translate into a variable expression. the quotient of 43 less than m and twice m

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 number 321,000,000 in scientific notation? also what is the number? ?

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?