Please help the answer options are 30, 19.2, 14.4, and 10.8

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

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 =