What is the volume for a cylinder with a diameter of 10 m and a height of 5 m? use 3.14 for pi

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

Ineed me i stuck and i don’t want to get it wrong

Which value of y will make the inequality y< -1 false?