Triangle XYZ is similar to Triangle ABC
Solve for k

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?

What is the domain of the step function f(x)=[2x]-1?

What are the triple angle formulas? is it related to double angle identities?