Entry Exam Category: High School Equivalency Exams
Course: General Education Development (GED)
Exam: GED Math practice test
Practice Question
The weight of a red blood cell is about 4.5 × 10*11 grams. A blood sample has 1.6 × 10 red blood cells. What is the total weight, in grams, of red blood cells in the sample the answer with the correct scientific notation.
Answer Choices
- A: 2.9 × 10^18
- B: 7.2 × 10^(-4)
- C: 7.2 × 10^(-77)
- D: 6.1 × 10^(-4)
Correct Answer: B
Rationale: Weight = (4.5 × 10^(-11)) * (1.6 × 10^7) = 4.5 * 1.6 × 10^(-11+7) = 7.2 × 10^(-4) grams. Thus, the correct answer is 7.2 × 10^(-4).