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    Arrow Flight Time Calculation

    Billy shoots an arrow from 10 feet above the ground. The height of this arrow can be expressed by the equation $ h=10-23t-10t^2 $, where $ t $ is time in seconds since the arrow was shot. If the center of a target is raised 5 feet off the ground, in how many seconds must the arrow reach the target in order for Billy to hit the bulls eye?

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    • $\frac{a}{b}$
    • .
    • 0
    • =
    • %
    • $a^n$
    • $a^{\circ}$
    • $a_n$
    • $\sqrt{}$
    • $\sqrt[n]{}$
    • $\pi$
    • $\ln{}$
    • $\log$
    • $\theta$
    • $\sin{}$
    • $\cos{}$
    • $\tan{}$
    • $($
    • $)$
    • $[$
    • $]$
    • $\cap$
    • $\cup$
    • $,$
    • $\infty$

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