What two numbers add to be 10 but multipy to be -57

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?

Standard deviation of 19,29,21,22,23

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?