If the simple interest on $3,000 for 2 years is 300 then what is the interest rate

Two lines parallel to the same plane are parallel to eachother

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

For which pair of functions is (gof)(a)=|a|-2?