Value of a varies directly as the square of the value of b, and b=3 when a=10. what is a when b=9?

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Louis wants to carpet the rectangular floor of his basement the basement has an area of 864 square feet the width of the basement is 2/3 its length what is the length of lewis's basement

Is a square always, sometimes, or never a parallelogram