Posted by **Sara** on Friday, June 24, 2011 at 7:15pm.

If the formula R= -0.0371 + 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 record be 48.1 secons or less?

- Algebra -
**drwls**, Friday, June 24, 2011 at 7:48pm
There is no t in your formula. You copied it wrong.

When you have the right formula, set it equal to 48.1 and solve for t. Add that to 1925. Later years will have a lower record, supposedly.

Of course, world records do not change at such a smooth rate. It is an approximation.

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