Use mental calculations -- compatible numbers, substitutions, equal products, or equal quotients -- to compute exact answers.
show all steps. indicate which method you are using.
1) 90 / 18
2) 15 x 104
3) 35 x 60
4) 5 x 18 x 4 x 10
5) 82 - 29

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?  

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

Aefg - almn. find the ratio of aefg to almn. a)1: 4 b)1: 2 c)2.1 d)4: 1