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Help with RC circuits. I found the time constant. But how do I find the current through the battery in 20.81 seconds? $2500 was invested for 3 years and earned $450 in interest. What is the rate of interest? Difference between Contribute to + infinite form and Contribute to + gerund form? Evaluate doub integral F*ds where F= <3y,-z,x^(2)> and S is the surface parameterized by v(s,t)= 0~~ ~~ Evaluate double integral F*ds where F= and S is the surface parametrized by v(s,t)= 0~~ ~~