To create an entry code, you must first choose 2 letters and then, 4 single-digit numbers. How many different entry codes can
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Answer:
Step-by-step explanation:
This is arithmetic since adding 4 to each term gets us to the next term in the sequence. That means that the common difference, d, is 4. The general arithmetic explicit formula is
and using the info given when a1 = 3 and d = 4:
or, if you want to make it easier to deal with:
(I just distributed through the parenthesis and then combined like terms. As you can see, arithmetic sequences are linear).