Calculator my man calculator
Number of cubes increases by 3 for each term.
an= 3n+1
D is the only one which would make sense :)
Answer:
for every 2 tables there are 10 chairs, so for 12 tables there are 60 chairs
I think that x may equal to -3. Because the sum of a triangle is always 180. 55+54=109 and 180-109=71 and -3+74=71
