Which of the following appear in the diagram below please help me

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?

Determine the area of a triangle with (see picture below)