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
Answer:
22x + 16
Step-by-step explanation:
No, your answer is not correct. you added l +b but you were supposed to add
L+B+L+B
Answer:
yes
Step-by-step explanation:
Answer:
1.) 2.79 × 10^-2
2.) 7.100 × 10^-5
3.) 5.060 × 10^-7
Step-by-step explanation:
Hope this helped.
Answer:
a (5a - 6b)
Step-by-step explanation:
Factor <em>a</em>
5a^2 - 6ab
<u>a (5a - 6b)</u>
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