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Two forces F1 = -7.10i + 7.40j and F2 = 6.80i + 3.40j are acting on...

Two forces F1 = -7.10i + 7.40j and F2 = 6.80i + 3.40j are acting on an object. The forces are measured in newtons, i and j are the unit vectors. The magnitude of the object's acceleration is observed to be 4.00 m/s2. What is the mass of the object?

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