Find the mean for the list of numbers.Cans of soup used by a family in a month: 1, 4, 9, 5, 14, 8Round answer to the nearest whole number if necessary.
A. 6 cans
B. 5 cans
C. 7 cans
D. 9 cans
Answer: C
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Write the expression as the sum or difference of multiples of logarithms.loga 
A. 
loga x - 
loga y + 
loga z
B. 2 loga x - 7 loga y - 4 loga z
C. 
loga x - 
loga y - 
loga z
D. 
loga x2 - loga y7 - loga z4
Solve the problem.The half-life of a certain radioactive substance is 22 years. Suppose that at time t = 0 , there are 21 g of the substance. Then after t years, the number of grams of the substance remaining will be 
How many grams of the substance will remain after 242 years? Round to the nearest hundredth when necessary.
A. 0.23 g B. 0.06 g C. 0.46 g D. 0.12 g
Identify the independent and dependent variables.z = 
A. independent: x and y, dependent: z B. independent: 4, dependent: z, x, and y C. independent: z, dependent: x and y D. independent: z, x, and y, dependent: 4
Determine whether the given function is concave up or concave down at the indicated point.
at 
A. concave down B. concave up