
an is the 'nth' term
a1 is first term
d=common difference (found by doing

)
n=numerical representation of which term
Answer:
87+52=139 180-139 = 41
41 is the measurement of the other side
Step-by-step explanation:
Answer:
75%
Step-by-step explanation:
The <em>number </em>increase is 9. 9 is what percent of 12? 9 is 75% of 12
I think the answer might be 72