Answer:
Send me a clarity question.
I can determine a function by drawing a vertical line. If this line pass trought the graph only one time, it's a function.
The only function there is the last one. (Right bottom)
A1=3
a2=3+4
a3=3+2*4
a4=3+3*4
---------------
an=3+(n-1)*4
there are (1671-3):4+1=1668:4 +1=417+1=418 numbers
The sum is (3+1671)*418/2=1674*209=349866
<em><u>According to a handy-dandy calculator it says it is 19. </u></em>
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<em><u>Hope this helps! :)</u></em>
Answer:
A
Step-by-step explanation:
cube!
its hard to explain, but it forms a cube <3