If a(x) = 3x + 1 and b(x)=square root x-4 if what is the domain of (b*a)(x)

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?

Ineed with this problem 21 show steps

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.