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2 years ago

HELP BECAUSE IM STUPID!

Mathematics

2 answers:

swat322 years ago

7 0

Answer:

an=15.5−2.5n

Step-by-step explanation:

Just took the test :)

mixer [17]2 years ago

6 0

I don't think you're stupid. ^^
Let's take the third term, 8. If n=3, then an should be 8.
The first answer gives 15+2.5*3=22.5.
The second answer gives 15.5+2.5=23.
The third answer gives 15-2.5*3=7.5.
The fourth answer gives 15.5-2.5*3=8.
Choice 4 is correct.

Let's try to actually find the equation on our own.
The equation for an arithmetic series is an=a0+dn where a0 is the term that comes before the first term.
The first term given is 13 and it decreases by 2.5 each time so n=-2.5 and the term that would be before 13 is 15.5.
Thus the equation is an=15.5-2.5n

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Step-by-step explanation:

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3 years ago

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Answer:

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Read 2 more answers

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Answer:

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