Please do step by step:
-x^2+4x+1

What two criteria are needed for triangles to be similar

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?

Give me the equations of two lines that have the same slope but are not parallel.