How do you write 17/4 as an mixed number?

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

What are the soultion(s) to the quadratic equation 40- x^2=0

Me. i can't figure out this question. give an explanation too. .