## Elementary Algebra

$= 0.5t$
Use the distributive property to simplify the algebraic expression: $-3t + 4.2t - 0.9t +0.2t$ $= t(-3 + 4.2 - 0.9 + 0.2)$ $= t (1.2 -0.7)$ $= t(0.5)$ $= 0.5t$