Question 239377
From your question, I understand that R = 48.1 and we must solve for t.

I assume this to be the case.  You did not say what R stands for.

48.1 = -0.037t + 50.1 and solve for t.  Can you finish now?

If not, write back.  I hope this is what you are looking for.

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I read your question again and made some arragements.

We need to solve for t, which represents time IN YEARS.

48.1 = -0.037t + 50.1 

48.1 - 50.1 = -0.037t

-2 = -0.037t

We now divide both sides by -0.037 to find t.

-2/-0.037 = t

54.1 = t

Understand?