Which statement must be true?

a. a statement cannot become a theorem

b. a statement cannot become a proof until it's a theorem

c. a statement cannot become a postulate until its proven

d. a statement cannot become a theorem until it becomes a postulate

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =