What is 0.25 as a percentage

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 =

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1