**Answer:**

Ratios and Proportions

Nurses do not prescribe medicine, but they administer medication to their patients. When doing so, they use ratios and proportions to help them. ... The ratios and proportions also allow the nurse to know how long the medication will stay in the body of the patient before needing another dosage.

**Step-by-step explanation:**

**Answer:**

5.6

**Step-by-step explanation:**

(2/5 + 1)(6 - 2)

= (2/5 + 5/5)(4)

= (7/5)(4)

= 28/5

= 5.6

**Answer:**

**(-ab^2)^3**.

**Step-by-step explanation:**

-a^3b^6 = (-ab^2)^3

**Answer:**

137.67

**Step-by-step explanation:**

hello !

first, we find the midpoint of each interval in the score column (you can look for it by adding the two numbers and then dividing it by 2). then, we multiply the midpoint to the frequency:

1 - 7 is 4 = 4 * 17 = **68**

8 - 10 is 9 = 9 * 15 = **135**

11 - 15 is 13 = 13 * 13 = **169**

16 - 20 is 18 = 18 * 6 = **108**

23 - 35 is 29 = 29 * 6 = **174**

36 - 50 is 43 = 43 * 4 = **172**

now, we look for the mean, which we get by adding the sums and dividing the total with 6.

or, when rounded to two decimal places, is equal to 137.67.

**Answer:**

180 mins

**Step-by-step explanation:**

60 = 1 hour

She drove for 3 hours.

60 x 3 = 180

180 mins

Hope this helped!