Which of the following statements is false?

What is the value of x? enter your answer in the box. photo attached.

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

17 in long 1.3 ft wide and 8in high what is the volume