Find the smallest positive a such that 5a ≡ 1(mod11).

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?  

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.