can someone please help me with this

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

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