if z varies directly with x and inversely with y , when x=2 , y = 5 and z= 10 , what is z when x =3 and y= 15 ​

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Astudent survey asked: "how tall are you (in inches)? " here's the data: 67, 72, 73, 60, 65, 86, 72, 69, 74 give the five number summary. a. median: 73, mean: 70.89, iqr: 5, min: 60, max: 74 b. 60, 66, 72, 73.5, 86 c. 60, 67, 72, 73, 74 d. 0, 60, 70, 89, 74, 100

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