Solve the problem.The surface area S of a spherical weather balloon is 4? times the square of the balloon's radius r. This can be represented by the equation S = 4?r2. What is the domain of the variable r?
A. (-?, ?)
B. (4?, ?)
C. (4, ?)
D. (0, ?)
Answer: D
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Solve the equation.-7(9 + x) = -21
A. {-30} B. {-12} C. {-6} D. {12}
Solve the problem.To measure the width of a river, a surveyor starts at point A on one bank and walks 72 feet down the river to point B. He then measures the angle ABC to be 
Estimate the width of the river to the nearest foot. See the figure below. 
A. 66 ft B. 173 ft C. 30 ft D. 28 ft
Use a system of linear equations to solve the problem.Jarod is having a problem with rabbits getting into his vegetable garden, so he decides to fence it in. The length of the garden is 8 feet more than 5 times the width. He needs 64 feet of fencing to do the job. Find the length and width of the garden.
A. length: 28 ft; width: 4 ft
B. length: 33 ft; width: 5 ft
C. length: 54
ft; width: 9
ft
D. length: 23 ft; width: 3 ft
Provide an appropriate response.A shipment of 20 digital cameras contains two that are defective. A random sample of three is selected and tested. Let X be the random variable associated with the number of defective cameras in a sample. Find the probability distribution of X and the expected number of defective cameras in a sample.
What will be an ideal response?