If the sine of an angle is equal to the opposite side divided by the hypotenuse (opp/hyp in the diagram what is cos and tan when we speak of angles and equality?

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?  

Ill mark the brainliest if you me with the these three questions 7,8,9

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?