Solve the problem.A stone is thrown into a pond. A circular ripple is spreading over the pond in such a way that the radius is increasing at the rate of 6.3 feet per second. Find a function, r(t), for the radius in terms of t. Find a function, A(r), for the area of the ripple in terms of r. 
A. (A ? r)(t) = 6.3?t2
B. (A ? r)(t) = 12.6?t2
C. (A ? r)(t) = 39.69?2t
D. (A ? r)(t) = 39.69?t2
Answer: D
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For the given measurement, briefly describe any likely sources of random error and any likely sources of systematic error.An agency wishes to determine the number of unemployed people in a town. They conduct a mini-census by delivering a survey to every household in the town, asking for information about household members. The information is entered into a computer.
What will be an ideal response?
Solve the problem.Find the least squares line through the points 
and 
A. y = -3x - 3 B. y = -15x - 21 C. y = -15x - 3 D. y = -3x - 21
Solve the problem.A box contains 4 slips of paper, on each of which is written the number 1, 2, 3, or 4, respectively. A slip is drawn, and the number on it is noted. That slip is put aside, and another slip is drawn and the number on it noted. What is the probability thata) the sum of the two numbers is 5?b) the first number drawn is a 2 and the second number is not 5?c) the sum of the two numbers is not 10?
A. a) 
b) 
c) 0
B. a) 
b) 
c) 1
C. a) 
b) 
c) 0
D. a) 
b) 
c) 1
Simplify.
÷ 
? (
÷ 9) ÷ (8 - 9)
A. 0 B. 4 C. undefined D. 1