Answer:
a + (n-1)*4
Step-by-step explanation:
Day n could be any particular day located on the x-axis of the bar chart. Each bar represents the amount of cupcakes sold on each of the four days numbered from 1 to 4. The height of each bar marks the number of cupcakes sold. According to the chart attached, the number of cupcakes sold on each day is listed below:
Day 1 : 1 cupcake sold
Day 2 : 5 cupckaes sold
Day 3: 9 cupcakes sold
Day 4: 13 cupckaes sold
Studying the graph carefully fully, it will be observed that the number of cupcakes sold increases by a margin of 4 after day one.
As such the number of cupcakes sold in n days can be modeled by:
Using the Arithmetic progression formula:
Tn = a + (n-1)d
d = common difference, = 4
a = first term = 1
n = number of days
Hence, number sold in day n:
a + (n-1)*4
Arithmetic progressio
