The 21st term in an arithmetic sequence is 47. What is the sum of the 12th and 30th terms in the sequence?

*Solution to yesterday’s problem:*

In order for Amelia to have a 90 average in math, the sum of all her test scores divided by 6 should be at least 90. The total of her scores so far is 85 + 95 + 93 + 88 + 97 = 458, and her last test is unknown so we’ll call it *x*. An equation for this situation would be

Solving this equation:

So Amelia must make at least an *82* on her last test to keep an A in math.

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