Which of the following inputs/outputs tables correctly matches the function x-6 f(x)

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

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.

Find two numbers if their ratio is 4: 7 and their difference is 123.