Help please !! it's asking "find the measure of the missing angle" yet there's nothing ??

What is the vertex form of f(x) = x2 + 6x + 3

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

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?