Multiply (x+6) to (x^2 - 7x + 12)

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 =

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Can you me find the missing length. i attached an image.