$3.7y^4 - 0.7y^3 + 2.2y - 4$
Work Step by Step
$(7.9y^4 - 6.8y^3 + 3.3y)+(6.1y^3 - 5)-(4.2y^4 + 1.1y - 1)$ $=7.9y^4 - 6.8y^3 + 3.3y+6.1y^3 - 5-4.2y^4 - 1.1y + 1$ $=3.7y^4 - 0.7y^3 + 2.2y - 4$
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