Aschool spent $900 on new desk for the start of the year. that amount included a 6% sales tax . what was the original price of the desk. before tax

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

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?  

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out