2.9: Exercise Supplement
Exercise Supplement
Symbols and Notations
For the following problems, simplify the expressions.
\(12 + 7(4 + 3)\)
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\(61\)
\(9(4 - 2) + 6(8 + 2) - 3(1 + 4)\)
\(6[1 + 8(7 + 2)]\)
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\(438\)
\(26 \div 2 - 10\)
\(\dfrac{(4+17+1)+4}{14-1}\)
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\(2\)
\(51 \div 3 \div 7\)
\((4 + 5)(4 + 6) - (4 + 7)\)
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\(79\)
\(8(2 \cdot 12 \div 13) + 2 \cdot 5 \cdot 11 - [1 + 4(1 + 2)]\)
\(\dfrac{3}{4} + \dfrac{1}{12}(\dfrac{3}{4} - \dfrac{1}{2})\)
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\(\dfrac{37}{47}\)
\(48 - 3[\dfrac{1 + 17}{6}]\)
\(\dfrac{29 + 11}{6 - 1}\)
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\(8\)
\(\dfrac{\dfrac{88}{11} + \dfrac{99}{9} + 1}{\dfrac{54}{9} - \dfrac{22}{11}}\)
\(\dfrac{8 \cdot 6}{2} + \dfrac{9 \cdot 9}{3} \dfrac{10 \cdot 4}{5}\)
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\(43\)
For the following problems, write the appropriate relation symbol (=,<,>) in place of the ∗.
\(22 * 6\)
\(9[4 + 3(8)] * 6[1 + 8(5)]\)
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\(252 > 246\)
\(3(1.06 + 2.11) * 4(11.01 - 9.06)\)
\(2 * 0\)
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\(2 > 0\)
For the following problems, state whether the letters or symbols are the same or different.
\(<\) and \(\not \ge\)
\(>\) and \(\not <\)
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Different
\(a = b\) and \(b = a\)
Represent the sum of \(c\) and \(d\) two different ways.
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\(c + d\) ; \(d + c\)
For the following problems, use algebraic notataion.
\(8\) plus \(9\)
\(62\) divided by \(f\)
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\(\dfrac{62}{f}\) or \(62 \div f\)
\(8\) times \((x + 4)\)
\(6\) times \(x\), minus \(2\)
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\(6x - 2\)
\(x + 1\) divided by \(x - 3\)
\(y + 11\) divided by \(y + 10\), minus \(12\)
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\((y + 11) \div (y + 10) - 12\) or \(\dfrac{y + 11}{y + 10} - 12\)
zero minus \(a\) times \(b\)
The Real Number Line and the Real Numbers
Is every natural number a whole number?
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Yes
Is every rational number a real number?
For the following problems, locate the numbers on a number line by placing a point at their (approximate) position.
\(2\)
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\(3.6\)
\(-1\dfrac{3}{8}\)
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\(0\)
\(-4\dfrac{1}{2}\)
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Draw a number line that extends from 10 to 20. Place a point at all odd integers.
Draw a number line that extends from \(−10\) to \(10\). Place a point at all negative odd integers and at all even positive integers.
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Draw a number line that extends from \(−5\) to \(10\). Place a point at all integers that are greater then or equal to \(−2\) but strictly less than \(5\).
Draw a number line that extends from \(−10\) to \(10\). Place a point at all real numbers that are strictly greater than \(−8\) but less than or equal to \(7\).
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Draw a number line that extends from \(−10\) to \(10\). Place a point at all real numbers between and including \(−6\) and \(4\).
For the following problems, write the appropriate relation symbol (=,<,>).
\(-3\) \(0\)
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\(-3 < 0\)
\(-1\) \(1\)
\(-8\) \(-5\)
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\(-8 < -5\)
\(-5\) \(-5\dfrac{1}{2}\)
Is there a smallest two digit integer? If so, what is it?
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Yes, \(-99\)
Is there a smallest two digit real number? If so, what is it?
For the following problems, what integers can replace x so that the statements are true?
\(4 \le x \le 7\)
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\(4, 5, 6\) or \(7\)
\(-3 \le x < 1\)
\(-3\) \(0\)
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\(-3 < 0\)
\(-3 < x \le 2\)
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\(-2, -1, 0, 1\), or \(2\)
The temperature today in Los Angeles was eighty-two degrees. Represent this temperature by real number.
The temperature today in Marbelhead was six degrees below zero. Represent this temperature by real number.
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\(-6°\)
On the number line, how many units between \(-3\) and \(2\)?
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\(-3 < 0\)
On the number line, how many units between \(-4\) and \(0\)?
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\(4\)
Properties of the Real Numbers
\(a + b = b + a\) is an ilustration of the property of addition.
\(st = ts\) is an illustration of the _________ property of __________.
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commutative, multiplication
Use the commutative properties of addition and multiplication to write equivalent expressions for the following problems.
\(y + 12\)
\(a + 4b\)
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\(4b + a\)
\(6x\)
\(2(a-1)\)
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\((a-1)2\)
\((-8)(4)\)
\((6)(-9)(-2)\)
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\((-9)(6)(-2)\) or \((-9)(-2)(6)\) or \((6)(-2)(-9)\) or \((-2)(-9)(6)\)
\((x + y)(x - y)\)
\(△ \cdot ⋄\)
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\( ⋄\cdot △\)
Simplify the following problems using the commutative property of multiplication. You need not use the distributive property.
\(8x3y\)
\(16ab2c\)
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\(32abc\)
\(4axyc4d4e\)
\(3(x+2)5(x−1)0(x+6)\)
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\(0\)
\(8b(a−6)9a(a−4)\)
For the following problems, use the distributive property to expand the expressions.
\(3(a + 4)\)
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\(3a + 12\)
\(a(b + 3c)\)
\(2g(4h + 2k\)
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\(8gh+4gk\)
\((8m+5n)6p\)
\(3y(2x+4z+5w)\)
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\(6xy+12yz+15wy\)
\((a+2)(b+2c)\)
\((x+y)(4a+3b)\)
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\(4ax+3bx+4ay+3by\)
\(10a_z(b_z + c)\)
Exponents
For the following problems, write the expressions using exponential notation.
\(x\) to the fifth.
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\(x^5\)
\(y + 2\) cubed.
\((a+2b)\) squared minus \((a+3b)\) to the fourth.
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\((a + 2b)^2 - (a + 3b)^4\)
\(x\) cubed plus \(2\) times \((y−x)\) to the seventh.
\(aaaaaaa\)
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\(a^7\)
\(2 \cdot 2 \cdot 2 \cdot 2\)
\((−8)(−8)(−8)(−8)xxxyyyyy\)
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\((-8)^4x^3y^5\)
\((x-9)(x-9) + (3x + 1)(3x + 1)(3x + 1)\)
\(2zzyzyyy + 7zzyz(a - 6)^2(a-6)\)
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\(2y^4z^3 + 7yz^3(a-6)^3\)
For the following problems, expand the terms so that no exponents appear.
\(x^3\)
\(3x^3\)
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\(3xxx\)
\(7^3x^2\)
\((4b)^2\)
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\(4b \cdot 4b\)
\((6a^2)^3(5c-4)^2\)
\((x^3+7)^2(y^2-3)^3(z+10)\)
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\((xxx+7)(xxx+7)(yy−3)(yy−3)(yy−3)(z+10)\)
Choose values for \(a\) and \(b\) to show that:
a. \(a+b)^2\) is not always equal to \(a^2 + b^2\)
b. \((a+b)^2\) may be equal to \(a^2 + b^2\)
Choose value for \(x\) to show that
a. \((4x)^2\) is not always equal to \(4x^2\).
b. \((4x)^2\) may be equal to \(4x^2\)
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(a) any value except zero
(b) only zero
Rules of Exponents - The Power Rules for Exponents
Simplify the following problems.
\(4^2 + 8\)
\(6^3 + 5(30)\)
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\(366\)
\(1^8 + 0^{10} + 3^2(4^2 + 2^3)\)
\(12^2 + 0.3(11)^2\)
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\(180.3\)
\(\dfrac{3^4 + 1}{2^2 + 4^2 + 3^2}\)
\(\dfrac{6^2 + 3^2}{2^2 + 1} + \dfrac{(1+4)^2 - 2^3 - 1^4}{2^5-4^2}\)
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\(10\)
\(a^4a^3\)
\(2b^52b^3\)
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\(4b^8\)
\(4a^3b^2c^8 \cdot 3ab^2c^0\)
\((6x^4y^{10})(xy^3)\)
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\(6x^5y^{13}\)
\((3xyz^2)(2x^2y^3)(4x^2y^2z^4)\)
\((3a)^4\)
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\(81a^4\)
\((10xy)^2\)
\((x^2y^4)^6\)
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\(x^{12}y^{24}\)
\((a^4b^7c^7z^{12})^9\)
\((\dfrac{3}{4}x^8y^6z^0a^{10}b^{15})^2\)
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\(\dfrac{9}{16}x^{16}y^{12}a^{20}b^{30}\)
\(\dfrac{14a^4b^6c^7}{2ab^3c^2}\)
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\(7a^3b^3c^5\)
\(\dfrac{11x^4}{11x^4}\)
\(x^4 \cdot \dfrac{x^{10}}{x^3}\)
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\(x^{11}\)
\(a^3b^7 \cdot \dfrac{a^9b^6}{a^5b^{10}}\)
\(\dfrac{(x^4y^6z^{10})^4}{(xy^5z^7)^3}\)
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\(x^{13}y^9z^{19}\)
\(\dfrac{(2x-1)^{13}(2x+5)^5}{(2x-1)^{10}(2x+5)}\)
\((\dfrac{3x^2}{4y^3})^2\)
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\(\dfrac{9x^4}{16y^6}\)
\(\dfrac{(x+y)^9(x-y)^4}{(x+y)^3}\)
\(x^n \cdot x^m\)
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\(x^{n+m}\)
\(a^{n+2}a^{n+4}\)
\(6b^{2n+7} \cdot 8b^{5n+2}\)
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\(48b^{7n+9}\)
\(\dfrac{18x^{4n+9}}{2x^{2n+1}}\)
\((x^{5t}y^{4r})^7\)
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\(x^{35t}y^{28r}\)
\((a^{2n}b^{3m}c^{4p})^{6r}\)
\(\dfrac{u^w}{u^k}\)
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\(u^{w-k}\)