During a certain academic year, the average cost for tuition and fees at a four-year public college was 6/11 the average cost for tuition and fees at a four-year private college. the average cost for tuition and fees at a four-year public college was $12,000. what was the average cost for tuition and fees at a four-year private college?
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Can anyone explain to me how to do this? anything will .

Andy has $310 in his account. each week, w, he withdraws $30 for his expenses. which expression could be used if he wanted to find out how much money he had left after 8 weeks?

Find a parametrization for the curve「and determine the work done on a particle moving along γ in r3 through the force field f: r^3--r^3'where f(x,y,z) = (1,-x,z) and (a) im (γ) is the line segment from (0,0,0) to (1,2,1) (b) im (γ) is the polygonal curve with successive vertices (1,0,0), (0,1,1), and (2,2,2) (c) im (γ) is the unit circle in the plane z = 1 with center (0,0,1) beginning and ending at (1,0,1), and starting towards (0,1,1)