How many times does 8 go in 400

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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 np3 /nc2 = 6, find the value of n