What is 15n2-n-28?

How do you get a million dollars in the mail in 5 minutes? What is the ratio of 8 batteries in three months? How is 2.75 written as a fraction? How many feet in 486.2 metres? How much is it to go to diggerland? What is 6854 divided by 17? What percent is 10 of 56? What is the answer when 0 is divided by something? How can you round 683315.2 to one decimal place? What is a noun for sufficient? How old are you if you were Born May 1993? How much can 14 go into 111? How do you write the full word of km? How do you round 20.990? Prime number using the exponent of 70? What is the shape with 4 right angles but not 4 equal sides? What is 27 times 30? How many syllables are in the word Extravagance? What does 139 look like in roman numerals? What is 8.9 in simplest form?