Answer:
Graph B
Step-by-step explanation:
We could do this analytically but without computation we can look at both graphs and see that graph A is incorrect because the first 7 weeks the number of pieces learned per week is increasing (positive slope) and then decreasing. If Sam was learning more pieces per week after the 7th week the graph should be increasing at a higher rate than for the first 7 weeks
We can also discount graph A purely by looking at the numbers. At the rate of 2 pieces per week, Sam should have learned 14 pieces at the end of week 7. But in graph A, the total number of pieces corresponding to week 7 is 35
Graph B is correct because the rate of learning(slope) is 2 for the first 7 weeks and then it increases to 3 per week after the 7th week. The second part of the graph rises more sharply than the first part indicating an increase in the rate of learning
