HESI A2 Quizlet Math

Correct Answer: C

Rationale: To determine the volume needed, divide the ordered dose by the concentration. 60 mg / 80 mg/mL = 0.75 mL. Choice C is correct as it correctly calculates the volume required. Choice A is incorrect as it is too low. Choice B is incorrect as it's also too low. Choice D is incorrect as it is too high.

Correct Answer: B

Rationale: To find the percentage of brown horses, we need to calculate the total number of horses first. Total = 10 (black) + 6 (brown) + 8 (two-color) + 3 (white) = 27 horses. Next, calculate the percentage of brown horses: (6 brown horses / 27 total horses) x 100% = 22.22%. Since we need to round to the nearest whole number, the percentage of brown horses is 22%, which is closest to choice B (20%). Therefore, the correct answer is B. Explanation for other choices: A: 15% - Incorrect because the percentage of brown horses is closer to 22%. C: 25% - Incorrect because the percentage of brown horses is not as high as 25%. D: 30% - Incorrect because the percentage of brown horses is lower than 30%.

Correct Answer: A

Rationale: The correct answer is A: 0.09%. To convert 0.0009 to a percentage, you move the decimal point two places to the right. This results in 0.09%, which is equal to 0.0009. Choice B: 9% is incorrect because it represents a value that is 100 times greater than 0.0009. Choice C: 0.01% is incorrect because it represents a value that is 10 times smaller than 0.0009. Choice D: 0.90% is incorrect because it is 10 times greater than 0.0009.

Correct Answer: C

Rationale: To add 7 2/3 and 5 5/12, first convert both mixed numbers to improper fractions: 7 2/3 = 23/3 and 5 5/12 = 65/12. Then, add the fractions: 23/3 + 65/12 = 92/12 + 65/12 = 157/12. Finally, convert 157/12 back to a mixed number: 157 ÷ 12 = 13 with a remainder of 1, resulting in 13 1/12. Therefore, the correct answer is C (13 1/12). Choices A, B, and D are incorrect as they do not match the calculated sum of the two mixed numbers.

Correct Answer: B

Rationale: To calculate the ideal body weight for a man who is 180cm tall: IBW = 50 + 2.3 * (180 - 150) = 50 + 2.3 * 30 = 50 + 69 = 119kg Therefore, the correct answer is B: 71kg. This is because the calculation results in an ideal body weight of 119kg, which corresponds to option B. The other choices (A, C, D) are incorrect as they do not match the calculated value.