Question

teddy is preparing to sell some wooden blocks at a garage sale. before pricing individual bags of blocks, he decides to determine the approximate number of blocks per pound by researching the weights of different sets of blocks. the graph shows his data. about how many blocks are there per pound? round to the nearest block. 10 20 30 40

Explanation:

Step1: Identify the slope formula

The number of blocks per pound is the slope of the line in the graph, which is calculated as $\frac{\text{change in number of blocks}}{\text{change in weight}}$.

Step2: Use two points on the line

From the graph, when weight is 5 lb, number of blocks is 100. So we take the points (0, 0) and (5, 100). The slope $m=\frac{100 - 0}{5 - 0}=\frac{100}{5} = 20$.

Answer:

20 (corresponding to the option "20")