Solve the problem.Anne and Nancy use a metal alloy that is 20.2% copper to make jewelry. How many ounces of an alloy that is 13% copper must be mixed with an alloy that is 25% copper to form 50 ounces of the desired alloy?
A. 30 oz
B. 35 oz
C. 20 oz
D. 22 oz
Answer: C
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Perform the indicated operation. Assume that all variables are nonnegative.
(
+ 14)
A. x
+ 14
B. x
+ 14
C. 
+ 
D. 
+ 14
Answer the question.Mark begins with three dollars and his money doubles in value for each of seven days. Marvin begins with thirty dollars and adds fifty dollars to his account for each of seven days. Monty begins with five hundred dollars and withdraws twenty dollars from his account for each of seven days. Who has the most money at the end of seven days?
A. Mark B. Marvin C. Mark and Marvin D. Monty
Solve the problem.The number of households in Country X with personal computers (PCs) and the total number of households in Country X are shown in the table below for various years.Households with Personal Computers (Millions)YearHouseholds with PCs Total Households200528.2195.5200930.4598.0201149.80100.5201559.82102.2201767.42114.0Let C(t) be the number (in millions) of households in Country X with PCs and H(t) be the total number (in millions) of households in Country X, both at t years since 2002. (i) Find equations of C and H.(ii) Estimate when fewer than 40% of households in Country X had PCs.
A. (i) C(t) = 3.67t + 9.63; H(t) = 4.30t + 52.37; (ii) Before 2005, fewer than 40% of households in Country X had PCs. B. (i) C(t) = 5.53t + 12.86; H(t) = 2.53t + 79.41; (ii) Before 2012, fewer than 40% of households in Country X had PCs. C. (i) C(t) = 4.81t + 16.01; H(t) = 0.99t + 68.42; (ii) Before 2014, fewer than 40% of households in Country X had PCs. D. (i) C(t) = 3.50t + 14.22; H(t) = 1.31t + 89.70; (ii) Before 2009, fewer than 40% of households in Country X had PCs.
Match the function with its graph.f(x) = 
A. 
B. 
C. 
D. 