Which of the following tables represent valid functions?​

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

State if the two triangles are congruent. if they are, state how you know?