Calculate total flux?!?

i just do not know how to use flux=EA for this question. thanks for looking. and exact answer please. A point charge q1 = 3.55 nc is located on the x-axis at x = 1.85m , and a second point charge q2= -6.30nc is on the y-axis at y= 1.15 m. 1. What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r1 = 0.775 m? 2.What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r2 = 1.60 m? 3. What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r3= 2.85m ? It is one of my MP hw. Could anyone help with this?
Answer:

Remember that the total flux through any surface of an ENCLOSED charge is just q/epsilonzero. The first sphere doesn't enclose any charge so the answer is zero. The second just encloses one of the charges so q/epsilonzero and the third includes both so q1/epzero + q2/epzero. A great question.

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Remember that the total flux through any surface of an ENCLOSED charge is just q/epsilonzero. The first sphere doesn't enclose any charge so the answer is zero. The second just encloses one of the charges so q/epsilonzero and the third includes both so q1/epzero + q2/epzero. A great question.

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