What is the output of the function when the input is 0?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?