Three of the vertices of a trapezoid are A(3,-3), B(12, 6) and C(4,8). The fourth vertex is labeled D. One of its bases is AB.
What is the equation of the line that includes base CD?

1) y=4x+ 1
2) y=4
3) y= x - 4
4) y = x + 4

What is the standard form of -5x^2+2x^4-11+x^3+3x

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 =

What is the missing step in this proof ?