Correct Answer: B

Rationale:
To convert from Celsius to Fahrenheit, use the formula: F = (C 9/5) + 32. Substituting 50°C: F = (50 9/5) + 32 = 122°F.
Therefore, 50°C is approximately 122°F.

Choices A, C, and D are incorrect because they do not reflect the accurate conversion of 50°C to Fahrenheit.

Correct Answer: A

Rationale:
To find the sum, you add the numbers 3.7, 7.289, and 4 together. 3.7 + 7.289 + 4 equals 14.989. The correct answer is 14.989 because it includes all decimal places from the sum of the numbers provided.
Choice B (5.226) is incorrect as it doesn't account for the sum of the given numbers.
Choice C (15.0) is incorrect as it rounds the sum to the nearest whole number, losing the decimal precision.
Choice D (5.012) is incorrect as it doesn't reflect the correct sum of the decimal numbers.

Correct Answer: A

Rationale:
To convert a decimal to a percent, you multiply by 100. In this case, 0.000026 * 100 = 0.0026%.
Therefore, the correct answer is A: 0.0026%.

Choices B, C, and D are incorrect because they incorrectly place the decimal point, resulting in percentages that are too large.

Correct Answer: C

Rationale: The shift from 1300 (1:00 PM) to 2000 (8:00 PM) corresponds to early afternoon to bedtime.
Therefore, the correct answer is C, as this healthcare professional works during the early afternoon to bedtime hours.

Choices A, B, and D are incorrect because the work hours fall within the early afternoon to evening time frame, not early morning, lunchtime, or midnight to sunrise.

Correct Answer: A

Rationale:
To find 18% of 600, you multiply 600 by 0.18, which equals 108. Since 108 is already a whole number, when rounding to the nearest whole number, it remains the same.

Choices B, C, and D are incorrect as they do not represent the correct calculation for finding 18% of 600.