What is the common difference between the elements of the arithmetic sequence below? –18, –22.5, –27, –31.5, –36

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?

Which of the following parabolas opens down?