If q→ p is true, then ~ p → ~ q is true. always sometimes never

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

Which statement justifies why angle ebc measures 90?

What is the perimeter of a rectangle if the length is 5 and the width is x?