Help.
Plz help with all 3 questions

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

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

Graph the line with the given slope m and y-intercept b. m=-3,b=1