First, round the mixed numbers to the nearest whole number and estimate the answer. Then find the exact answer and write it in simplest form.4 ? 5
A. 22
B. 9
C. 22
D. 20
Answer: C
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Determine an appropriate domain of the function. Identify the independent and dependent variables.A weather balloon of radius r (in meters) is filled with air. The volume V of the balloon is given by the function 
. Assume the balloon can hold up to 4 m3 of air.
A. D = 
The independent variable is V.
The dependent variable is r.
B. D = [0, 4]
The independent variable is r.
The dependent variable is V.
C. D = 
The independent variable is r.
The dependent variable is V.
D. D = 
The independent variable is r.
The dependent variable is V.
Find the exact value of the expression.cos 
sin 
- cos 
sin 
A. 
B. 
C. 
D. 1
Write the fraction.According to a recent study, 10 out of 18 visits to a hospital emergency room were for an injury. What fraction of emergency room visits are NOT injury-related?
A. 
B. 
C. 
D. 
Subtract and simplify. Write the answer as a mixed number as needed.11 - 4
A. 7
B. 7
C. 10
D. 6