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Exam 2: Introduction to Real Numbers and Algebraic Expressions

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Question 81

Multiple Choice

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Collect like terms. -7x - 0.4y + 0.6x + 2y

A) 7.6x + 1.6y
B) 1.6x + 7.6y
C) 7x + 0.6x - 0.4y + 2y
D) 7.6x - 0.4y + 2

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Question 82

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Evaluate the expression for the given value of x. -

A) -216
B) 24
C) -24
D) -18

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Question 83

Multiple Choice

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Subtract. -0 - 24

Add. Do not use a number line except as a check. --8 + (-63) + 59 + (-37)

Add. Do not use a number line except as a check. --3 + 6

Subtract. --45 - (-77)

Write an inequality with the same meaning. -y > 21

Multiply. -

Add. Do not use a number line except as a check. -9 + (-1)

Evaluate. - , when m = 12 and n = 3

Find an equivalent expression with the given denominator. -

Evaluate -x for the given value of x. -x = 32.2

Multiply. --16 · (-6)

Find an equivalent expression with the given denominator. -

Simplify. -2{[6(x - 1) + 7] - [2(3x - 1) + 7]}

Write an equivalent expression. Use a commutative law. -pq + z

Simplify. -6 + (-12) + 5 + (-9) + 15 + (-19)

Divide. --1 ÷ 0.05

State the real number that corresponds to the situation. -One country exported $70,800,000 less than it imported, giving it a negative trade balance.

Solve the problem. -A machinist has flat metal plate that is 8.312 cm thick. He laminates the metal plate with four more layers that are 1.718 cm, 2.854 cm, 4.930 cm, and 4.291 cm thick. He then grinds off 3.090 cm from the top of the plate, then 2.285 cm more, and finally another 6.925 cm. Find the new thickness of the plate.