Question: charge 1 of 7 microcoulombs is located at the origin...

Charge 1 of +7 micro-coulombs is located at the origin, charge 2 of -6 micro-coulombs is located at x = 0 cm, y = -15 cm, and charge 3 of +5 micro-coulombs is located at x = -20 cm, y = 0 cm. What is the direction of the total electric force on charge 1 measured counter-clockwise from the +x axis, in degrees?

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