Number 5 should be no solution becuase the n's cancel out.
For 6: Part A is -2 because slope represents the change in weigh/change in time (-2/1 or -2) Part B is y=-2x+231 (-2 is the slope and 231 is the y-intercept) For part C, based on the slope, we can find that her weight will go below 200 at week 16 when it is 199
Well because they want 1000 dollars profit they need the inequality "15x is greater than or equal too 1700 dollars" But overall if you divide 1700 by 15 and round up on the decimal you get 114. So 114 is your answer.