Find the missing side. round to the nearest tenth. urgent!

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

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

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?