Algebra I All-in-One For Dummies. Mary Jane Sterling

Algebra I All-in-One For Dummies

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A. Rounding math to the nearest integer, you drop off the math , because its decimal value is about 0.333, or less than half; so, math rounds to 13. Applying the greatest integer function, math . So the values are the same.

35 yourturn Round 146.95 to the nearest integer.

36 math

Practice Question Answers and Explanations

1 5. First do the subtraction in the parentheses. Then multiply the result by 3. Finally, add 14.

2 77. Work inside the brackets first. Perform the two operations in the parentheses. Then perform the multiplications on the two results. Add the products. Then multiply that result by 4. Finally, subtract 11.

3 180. Multiplying by the 5 outside the braces will come last. First, do the subtraction in the parentheses. Then add inside the brackets. Multiply that result by 8, and then subtract 4. Finally, multiply by 5.

4 math Your last step will be to divide the result in the numerator by the result in the denominator. In the numerator, first do the subtraction in the parentheses, multiply that result by 3, and then subtract that product from 19. Finally, find the square root of the difference. In the denominator, do the subtraction in the parentheses, multiply the result by 4, subtract that product from 8, and then multiply the difference by 6. Finally, subtract 1 from the product. Then you can do the division indicated by the fraction line.

5 –56. Working inside the absolute value bars, first do the subtraction in the parentheses, multiply the difference by 3, and then subtract the product from 6. Find the absolute value of the result before multiplying by 5. Then subtract the product from 4.

6 8. Work on the numerator and denominator separately — leaving the division for the last step. In the numerator, do the subtraction in the first parentheses and do the multiplication in the last term. Multiply the remainder by 5. Then subtract the second term from the first. In the denominator, do the subtraction under the first radical. Then look at the radical-within-the-radical and do the addition. Evaluate the two radical values you’ve formed. Next, find the difference under the remaining radical and evaluate it. Perform the subtraction in the denominator — and, finally, divide.

If you’re ready to test your skills a bit more, take the following chapter quiz that incorporates all the chapter topics.

7 math . Multiply each term in the parentheses by 4.

8 math . Multiply each term in the parentheses by –3.

9 math . This problem involves operations with fractions. You will see more on fractions in Chapter 4.

10 –5.

11 math .

12 math .

13 47. Regroup so that the first two numbers are together. Their sum is 0!

14 5. Regroup so that the second two numbers are together.

15 70. Regroup so that the first two numbers are together. The fraction reduces to make the multiplication easier.

16 110. Regroup so that the second two numbers are together. The multiplication is simple!

17 5. Switch the order of the second and third numbers.

18 470. Switch the order of the second and third numbers.

19 78. Switch the order of the second and third numbers.

20 8. Switch the order of the second and third numbers.

21 560. There’s a lot of switching that goes on here to make the problem easier. Your goal is to be able to multiply fractions times numbers that will eliminate their denominators. In this particular problem, I’m bringing the math up next to the 16 and the math up next to the 18.

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