Solve the problem.Mary and her brother John collect foreign coins. Mary has twice the number of coins that John has. Together they have 135 foreign coins. Find how many coins Mary has.
A. 81 coins
B. 45 coins
C. 18 coins
D. 90 coins
Answer: D
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Use the formula for the sum of the first n terms of a geometric sequence to evaluate the sum.
A. 820 B. -204 C. -500 D. -51
Evaluate the function for the indicated input and interpret the result.The table lists the number of persons voting in an election by election year and sex, for a small community. 
Let this table be a partial numerical representation of a function f, where 
computes the number of persons who voted in the year x whose sex is y. Evaluate 
Interpret the result.
A. f (1992, Male) - f (1992, Female) = 170 In the year 1992, 170 more men voted than women. B. f (1992, Male) - f (1992, Female) = -170 In the year 1992, 208 more women voted than had previously voted in 1988. C. f (1992, Male) - f (1992, Female) = 161 In the year 1992, 161 more men voted than women. D. f (1992, Male) - f (1992, Female) = 208 In the year 1992, 208 more men voted than women.
Perform the indicated clock arithmetic.1 ? 3 (5-hr clock)
A. 5 B. 4 C. 3 D. 0
The matrix is the final matrix form for a system of two linear equations in variables x1 and x2. Write the Solution of the system.
A. x1 = 3 x2 = 5 B. x1 = -5 x2 = -3 C. x1 = 5 x2 = t for any real number t D. x1 = 5 x2 = 3