To evaluate the expression \( hj^2k \) with the given values \( h = -8 \), \( j = -0.8 \), and \( k = -7 \), we follow these steps:
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Calculate \( j^2 \): \[ j^2 = (-0.8)^2 = 0.64 \]
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Substitute \( h \), \( j^2 \), and \( k \) into the expression \( hj^2k \): \[ hj^2k = (-8) \times (0.64) \times (-7) \]
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First, calculate \( (-8) \times (0.64) \): \[ -8 \times 0.64 = -5.12 \]
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Now, multiply the result by \( -7 \): \[ -5.12 \times (-7) = 35.84 \]
Thus, the value of \( hj^2k \) is \(\boxed{35.84}\).