Homework Explained - Math Practice 101

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Grade 8 McGraw Hill Glencoe - Answer Keys
Chapter 1 - Real Numbers; Lesson 9: Estimate Roots


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  • Question 32 (request help)

    The radius of a circle with area A can be approximated using the formula \(\text{r} = \sqrt{\cfrac{\text{A}}{3}}\). Use a number line to estimate the radius of each circular swimming pool to the nearest integer.

    Pool 1 : \(\text{A} = 240\text{ ft}^{2}\)

    \(\text{r} = \text{_____}\)

    Pool 2 : \(\text{A} = 105\text{ ft}^{2}\)

    \(\text{r} = \text{_____}\)

    Pool 3 : \(\text{A} = 198\text{ ft}^{2}\)

    \(\text{r} = \text{_____}\)

  • Pool 1:   ft.
    Pool 2:   ft.
    Pool 3:   ft.
  • Question 33 (request help)

    After an accident, officials use the formula \(\text{s} = \sqrt{24\text{m}}\) to estimate the speed the car was traveling based on the length of the car’s skid marks. In the formula, s represents the speed in miles per hour and m is the length of the skid marks in feet. If a car leaves a skid mark of 50 feet, what was its approximate speed?

  • About     miles per hour

  Spiral Review  

Write each of the following as a fraction in simplest form.

  • Question 38 (request help)

    Of the 150 students in Mr. Bacon's classes, 16% play soccer, \(\cfrac{9}{25}\) play basketball, \(3^{3}\) play football and 14 do not play a sport at all. Write the number of students in order from least to greatest.

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