Use a truth table to determine whether the symbolic form of the argument is valid or invalid.p ? qp ? r----? ~ r ? q
A. 
Symbolic argument is invalid.
B. 
Symbolic argument is invalid.
C. 
Symbolic argument is valid.
D. 
Symbolic argument is invalid.
Answer: D
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Solve. If necessary, round percents to the nearest tenth, dollar amounts to the nearest cent, and all other numbers to the nearest whole.The marketing division of a company predicts that 78% of the 450 special promotional sale items will sell on the first day of sale. What percent of the promotional items should be available after the first day of sale? How many special promotional items should be available after the first day of sale?
A. 78%; 351 items B. 22%; 99 items C. 22%; 351 items D. 78%; 99 items
Evaluate the sum.
A. 385 B. 1210 C. 1000 D. 3025
Factor completely, or state that the polynomial is prime.3x2 - 27
A. 3(x - 3)2 B. prime C. 3(x + 3)(x - 3) D. 3(x + 3)2
Find the vertex, focus, and directrix of the parabola.x2 = 16y
A. Vertex: V(0, 0); focus: F(4, 0); directrix: x = 4 B. Vertex: V(0, 0); focus: F(0, -4); directrix: x = - 4 C. Vertex: V(0, 0); focus: F(4, 0); directrix: y = 4 D. Vertex: V(0, 0); focus: F(0, 4), directrix: y = -4