What percentage of her income is left after Mary spent 15%?

Correct Answer: B

Rationale: To determine the percentage of income remaining after spending 15%, subtract the percentage spent from 100% (100% - 15% = 85%). Therefore, Mary has 85% of her income left, which aligns with answer choice B. Choice A (12%) is incorrect because it represents the remaining amount after spending 88% of her income. Choice C (75%) is incorrect as it does not account for the 15% already spent. Choice D (95%) is incorrect as it does not consider the amount spent by Mary.

Correct Answer: C

Rationale: To find the percentage of 8 in 40, divide 8 by 40 to get 0.2. Multiply this result by 100 to convert it to a percentage: 0.2 100 = 10%. Therefore, 8 is 10% of 40, making choice C the correct answer. Choices A, B, and D are incorrect percentages calculated from incorrect divisions and multiplications.

Correct Answer: C

Rationale: In this math question from the HESI A2 Quizlet, the correct answer is C) 27. To explain why this is the correct answer, we can calculate three tenths of 90 by multiplying 90 by 0.3 (which is the same as dividing by 10 and then multiplying by 3). So, 90 x 0.3 = 27. Option A) 18 is incorrect because it represents 2 tenths of 90, not 3 tenths. Option B) 45 is incorrect because it represents half of 90, not 3 tenths. Option D) 36 is incorrect because it represents 4 tenths of 90, not 3 tenths. Educationally, understanding fractions and decimals is crucial for basic math competency. This question assesses the test-taker's ability to convert fractions to decimals and perform simple multiplication. It also reinforces the concept of tenths and their relationship to whole numbers. Students should practice these types of questions to build fluency in working with fractions and decimals, which are foundational skills for more complex math concepts.

Correct Answer: A

Rationale: First, convert the child's weight from pounds to kilograms: 44 lb · 2.2 = 20 kg. Next, calculate the required dosage: 20 kg 20 mg/kg = 400 mg. Since each tablet contains 80 mg, divide the total dosage by the dosage per tablet: 400 mg · 80 mg/tablet = 5 tablets. Therefore, the correct answer is 5 tablets. Choice B is incorrect because it does not account for the actual number of tablets needed. Choice C is incorrect as it is an underestimation of the required tablets. Choice D is incorrect as it is an underestimation of the required tablets.

Correct Answer: C

Rationale: To find the volume required, divide the prescribed dose (60 mg) by the concentration available (80 mg/mL): 60 mg · 80 mg/mL = 0.75 mL. Therefore, 0.75 mL is the correct amount to administer. Choice A (1 ml) is incorrect as it does not consider the concentration of the solution. Choice B (0.5 ml) is incorrect as it is half the correct amount. Choice D (1.25 ml) is incorrect as it is more than the calculated correct amount.