Question

in 9–14, use the data to write a ratio for each comparison in three different ways. a person’s blood type is denoted with the letters a, b, and o, and the symbols + and −. the blood type a+ is read as a positive. the blood type b− is read as b negative. 9. o+ donors to a+ donors 10. ab− donors to ab+ donors 11. b+ donors to total donors 12. o− donors to a− donors 13. a+ and b+ donors to ab+ donors 14. a− and b− donors to ab− donors 15. which comparison does the ratio \\(\frac{90}{9}\\) represent? 16. which comparison does the ratio 20:21 represent? blood donors table: type a+ has 45 donors, b+ has 20, ab+ has 6, o+ has 90, a− has 21, b− has 0, ab− has 4, o− has 9, total has 195

Explanation:

Problem 9: O+ donors to A+ donors

Step1: Identify the number of O+ and A+ donors.

From the table, O+ donors = 90, A+ donors = 45.

Step2: Write the ratio as a fraction.

The fraction form is $\frac{\text{O+ donors}}{\text{A+ donors}} = \frac{90}{45}$.

Step3: Write the ratio using a colon.

The colon form is $90 : 45$.

Step4: Write the ratio in word form.

The word form is "90 to 45".

Problem 10: AB− donors to AB+ donors

Step1: Identify the number of AB− and AB+ donors.

From the table, AB− donors = 4, AB+ donors = 6.

Step2: Write the ratio as a fraction.

The fraction form is $\frac{\text{AB− donors}}{\text{AB+ donors}} = \frac{4}{6}$.

Step3: Write the ratio using a colon.

The colon form is $4 : 6$.

Step4: Write the ratio in word form.

The word form is "4 to 6".

Problem 11: B+ donors to total donors

Step1: Identify the number of B+ donors and total donors.

From the table, B+ donors = 20, total donors = 195.

Step2: Write the ratio as a fraction.

The fraction form is $\frac{\text{B+ donors}}{\text{total donors}} = \frac{20}{195}$.

Step3: Write the ratio using a colon.

The colon form is $20 : 195$.

Step4: Write the ratio in word form.

The word form is "20 to 195".

Problem 12: O− donors to A− donors

Answer:

Step1: Identify the values in the ratio.

First value = 20 (B+ donors), Second value = 21 (A− donors).

Step2: Match to the comparison.

The ratio $20:21$ represents "B+ donors to A− donors".

Final Answers (Key Ratios):

1. $\frac{90}{45}$, $90:45$, 90 to 45
2. $\frac{4}{6}$, $4:6$, 4 to 6
3. $\frac{20}{195}$, $20:195$, 20 to 195
4. $\frac{9}{21}$, $9:21$, 9 to 21
5. $\frac{65}{6}$, $65:6$, 65 to 6
6. $\frac{21}{4}$, $21:4$, 21 to 4
7. O+ donors to O− donors
8. B+ donors to A− donors