Pls help. i need the steps used

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

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

I’m really confused and need your assist me with this question i’ve never been taught