You haven't shared all of the possible answers. The graph you've shared has a y-intercept of 4, which differs from the y-intercept of <span>y=−1/2x+8.
Go on to the other 3 possible answers. Which answer shows a y-intercept of 8 and a slope of -1/2?</span>
Try dividing 150 by 2 1/2 and your answer would be 6.25 you may want to double check that math though
Some of the many possible answers can be..
3.3
2.2
0.5
3p=pe^tr,,3=e^0.04t ,,then use log to find t
