5/4 = ÷ please help me

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

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

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.