intermed Algebra

I need help solving this , If the formula R= -0.037t + 50.1 can be used to predict the world record in the 400 meter dash t years after 1925, for what years will the world records be 48.8 seconds or less. I am clueless what to do been on this for an hour.

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  1. R=timing,
    t=years after 1925, for example
    in 1950 t=25, and so on.

    The problem you need to solve is
    R=48.8 s
    and need to solve for t.
    48.8=-0.037t+50.1
    Solution : t=35.1
    This means by 1925+35.1=1961 (round up), world records will be 48.8 seconds or less.

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