Remove or add parentheses as indicated.Rewrite (x + y + z)(x - y) without parentheses.
A. x2 - y2 + xz - yz
B. x2 - y2 + xz - yz - 2xy
C. x2 - y2 + xz - yz + 2xy
D. x2 + y2 + xz - yz + 2xy
Answer: A
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Find the expected value.In a large casino, the house wins on one of its games with a probability of 51%. All bets in the game are 1 : 1 . If you win, you gain the amount you bet; if you lose, you lose the amount you bet. What is the expected value to the player of a single game?
A. $0.020 B. -$0.020 C. -$0.510 D. -$0.010
Solve the problem.To solve the rational inequality 
? 2, you can first write the inequality with 0 on one side and the other side expressed as a single fraction. What value or values of x make the numerator of that fraction equal to 0?
A. {2} B. {-2} C. {2, 3} D. {3}
Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.e3x - 7 - 6 = 1489
A. 1.06 B. 4.77 C. 2.44 D. 3.39
Solve.Harry cuts a board 
feet long from one 15 feet long. How long is the remaining piece?
A. 12
feet
B. 11
feet
C. 11
feet
D. 11
feet