Question

which type of graph would best represent the monthly utility expenses of household z over a year, and why?
line graph, because it can show trends over time.
pie chart, because it shows parts of a whole.
scatter plot, because it shows the relationship between two variables.
histogram, because it shows the frequency of expenses.
july $180
august $182
september $190
october $195
november $200
december $215

Explanation:

The data shows monthly utility expenses over a year, which represents a trend over time. A line - graph is ideal for showing trends over time as it can clearly display how the values change from one month to another. Pie - charts are for parts of a whole, scatter - plots for relationships between two variables, and histograms for frequency of data.

Answer:

Line graph, because it can show trends over time.