The tickets for an upcoming ballet cost $54 per person. mrs. anastos wants to purchase 16 tickets for her friends. what is the total cost of the tickets?

$540
$546
$810
$864

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.