Download Beginning and Intermediate Algebra by S. Messersmith PDF

By S. Messersmith

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Synopsis of elementary results in pure and applied mathematics

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Example 1 Rewrite each product in exponential form. ” 6 is the base. It appears as a factor 5 times. So, 5 is the exponent. 3 is the base. 2 is the exponent. mes47759_ch01_001-025 10/22/2007 16:48 Page 20 pinnacle 201:MHIA038:mhmes2:mes2ch01: 20 Chapter 1 The Real Number System and Geometry You Try 1 Rewrite each product in exponential form. a) 4 ؒ 4 ؒ 4 ؒ 4 ؒ 4 ؒ 4 b) 3 3 3 3 ؒ ؒ ؒ 8 8 8 8 We can also evaluate an exponential expression. Example 2 Evaluate. a) 25 b) 53 Solution a) 25 ϭ 2 ؒ 2 ؒ 2 ؒ 2 ؒ 2 ϭ 32 b) 53 ϭ 5 ؒ 5 ؒ 5 ϭ 125 4 2 4 4 16 c) a b ϭ ؒ ϭ 7 7 7 49 1 d) 8 ϭ 8 e) 14 ϭ 1 ؒ 1 ؒ 1 ؒ 1 ϭ 1 4 2 c) a b 7 d) 81 e) 14 2 appears as a factor 5 times.

3 1 and is 12. 4 6 You Try 11 Find the LCD for 4 5 and . 6 9 To add or subtract fractions with unlike denominators, begin by identifying the least common denominator. Then, we must rewrite each fraction with this LCD. This will not change the value of the fraction; we will obtain an equivalent fraction. 1 Review of Fractions Example 12 Rewrite 13 3 with a denominator of 12. 4 Solution 3 ? 3 so that ϭ . 4 4 12 To obtain the new denominator of 12, the “old” denominator, 4, must be multiplied by 3.

23) 29Њ A C B 5 cm 5 cm 3 cm 16) Find the measure of the missing angles. 24) 8 in. 4 in. 9 in. C 25) B A 2 ft 80Њ 2 ft 2 ft 26) What can you say about the measures of the angles in an equilateral triangle? 27) True or False: If a triangle has two sides of equal length, then the angles opposite these sides are equal. Objective 2 17) The sum of the angles in a triangle is degrees. 28) True or False: A right triangle can also be isosceles. Find the missing angle and classify each triangle as acute, obtuse, or right.

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