Final answer:
The expression to represent the number of sunny days in Denver, Colorado this year is 300 + (0.05 * 300). The number of sunny days this year is 315.
Step-by-step explanation:
The expression to represent the number of sunny days in Denver, Colorado this year is 300 + (0.05 * 300), which is option B.
Since there were 300 sunny days last year and there were 5% more sunny days this year, we need to calculate 5% of 300, which is 0.05 times 300.
The expression can be simplified to 300 + 15, which equals 315 sunny days in Denver, Colorado this year.