21 = 35 cos theta t - 4.9t^2, solve for t

This needs to go into an Excel spreadsheet; I don't need the actual value of t, as theta's value changes (0 to 90). I just need help rearranging it in order to enter the equation into my spreadsheet (so it's t = something).

If it can't be done, then... well.. it can't be done.

This needs to go into an Excel spreadsheet; I don't need the actual value of t, as theta's value changes (0 to 90). I just need help rearranging it in order to enter the equation into my spreadsheet (so it's t = something).

If it can't be done, then... well.. it can't be done.

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