The graph shows a proportional relationship between the number of books sold at a yard sale and the amount of money collected from book sales.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab