Step-by-step explanation:
3.78w + 0.21 + 1.05w = (3.78w + 1.05w) + 0.21 = 4.83w + 0.21
3.6w + 0.2 - 1.05w = (3.6w - 1.05w) + 0.2 = 2.55w + 0.2
(3.6w + 0.2)(1.05) = (3.6w)(1.05) + (0.2)(1.05) = 3.78w + 0.21
used the distributive property a(b + c) = ab + ac
