I need the surface area and volume

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

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?

If the discriminant if a quadratic equation is 4 which statement describes the roots?