Answer:
357 = 51d
Step-by-step explanation:
17/d = 51/21
Using cross products
17*21 = 51*d
357 = 51d
solving
357/51 = 51d/51
7 =d
Answer:
Step-by-step explanation:
You first have to add all of the numbers in the data set, than you divide by how many numbers are in the data set
