Identify the error in the following statement. 4/5(2/7divided by -1/11)=(-1/11 divided by 2/7)4/5

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

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