Work out an expression for the nth term of the quadratic sequence 11 15 21 29 39

PLS ANSWER THIS CORRECTLY ASAP THANKS

6n^2-7n-75=0 solve by quadratic formula

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

Is the power produced directly proportional to the wind speed, give reasons for your answer?