Factor the special products.81x2 - 126xy + 49y2
A. (81x + 1)(x + 49)
B. (9x - 7y)2
C. (9x - 7y)(9x + 7y)
D. (9x + 7y)2
Answer: B
Mathematics
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Solve the inequality, and then express in interval notation.12x - 7 ? 11x - 18
A. x < 12; (-?, 12) B. x ? -11; [-11, ?) C. x ? -11; (-?, -11] D. x > 12; (12, ?)
Mathematics
Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 4 years. If necessary, round to three decimal places.
A. 0.324 B. 304.693 C. 3046.927 D. 0.032
Mathematics
Test the equation for symmetry with respect to the x-axis, the y-axis, and the origin.2x = 4y2 - 1
A. origin only B. x-axis only C. x-axis, y-axis, origin D. y-axis only
Mathematics
Find the root. Assume that variables represent any real number. 
A. 
B. - x8
C. -
D. x8
Mathematics