3(2d - 7) = (2 + 4d)2 i need the steps

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Which expressions are equivalent to -6 + 3m

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?