Homework Explained - Math Practice 101

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Grade 8 McGraw Hill Glencoe - Answer Keys


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  • Question 20 (request help)

    The height of a stone that is dropped from a 144-foot tall bridge can be modeled by the function \(\text{h} = -16\text{t}^{2} + 144\), where t is the time in seconds and h is the height of the stone above the river. Complete the table of values below and graph the function on the coordinate plane.

    How long does it take for the stone to reach the river?

  •     seconds
  • Question 21 (request help)

    Rachel sketched the graph of a quadratic function as shown. Determine if each statement is true or false.

    a. The y-intercept is (0, 2).

    b. The graph opens downward, so the coefficient of \(\text{x}^{2}\) is positive.

    c. The graph represents the function \(\text{y} = -\text{x}^{2} + 2\).

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  Spiral Review  

Evaluate each expression.

Evaluate each expression if a = 2, b = -3, and c = 6.

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