Three more than the quotient of a number and 8 is equal to 9

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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?  

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?