Factor in Quadratic Formx^4-2x^2-48

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

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

Which table shows a proportional relationship between miles traveled and gas used?