HELP
It’s a quadratic word problem. It’s due in the morning and I have no clue!!!

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

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length